Why the coverage figure decides more than the speed rating

The spec most buyers compare first is the class rating: AC750, AX1800, AX3000, BE11000. For a dead zone it is the wrong number to lead with. A class rating describes the link speed the radios can negotiate; it says nothing about whether the device is rated to reach a room on the far side of two walls. The number that does is the manufacturer’s coverage area, and in this set it exists on only one side of the decision.

None of the three plug-in extenders publishes one. TP-Link’s datasheets for the RE220 and RE605X and Netgear’s for the EAX15 give band speeds, port speeds, antenna counts and power draw, but no square-foot rating. All four mesh kits do publish one: eero states 1,500 sq ft per 6+ unit, TP-Link rates the Deco X55 at up to 4,500 sq ft for the 2-pack and 6,500 sq ft for the 3-pack, Google rates each Nest Wifi Pro point at up to 2,200 sq ft with 4,400 sq ft for the 2-pack, and Netgear rates the Orbi 770 3-pack at up to 8,000 sq ft.

That asymmetry is the practical difference between the two routes. With a mesh kit you can put the manufacturer’s figure against your floor plan before you order. With an extender you are buying the AC750 or AX1800 rating and finding out about reach after it arrives. That is not an argument that extenders reach less far; it is a statement that nobody has published how far they reach, and the scores in this guide treat the missing figure as a gap rather than assuming it is adequate.

Two cautions on the figures that do exist. eero publishes only the per-unit number and no combined total for the 2-pack. TP-Link publishes the reverse for the Deco X55: 2-pack and 3-pack totals, no single-unit figure. Google is the only one of the four to publish both per-point and per-pack numbers, which is part of why the Nest Wifi Pro scores highest on this factor.

Count the bands, not the word on the box

Netgear calls the EAX15 a “Mesh Extender”. Amazon calls the eero 6+ a mesh system. On the specification that governs wireless relay design, the two are the same: dual-band, 2.4GHz and 5GHz, with no third radio. The band a dual-band unit uses to talk to the router is the same band it serves to the laptop in the weak room; TP-Link’s RE220 datasheet describes exactly that arrangement.

Five of the seven products here are dual-band: the RE220, RE605X, EAX15, eero 6+ and Deco X55. Only two add a third band. The Nest Wifi Pro is tri-band Wi-Fi 6E, and Google’s support documentation states the 6GHz band is used for mesh connectivity between points, which leaves 2.4GHz and 5GHz for client devices. The Orbi 770 is tri-band Wi-Fi 7, and Netgear’s datasheet describes Multi-Link Operation combining the 5GHz and 6GHz bands for backhaul between router and satellites, separate from the 2.4GHz client band. Note the difference between the two: Google’s design reserves one band for the links; Netgear’s shares 5GHz between backhaul and clients while keeping 2.4GHz clear. That is why the Nest Wifi Pro scores a point higher on backhaul design.

So “mesh versus extender” is not the question that separates these products on relay design. “Two bands or three” is. If the weak room will hold a TV streaming while two phones browse, and no cable can reach it, the tri-band kits are the only two here that keep that room’s traffic off the band carrying the link back to the router.

The cable that makes backhaul irrelevant

If an Ethernet cable can reach the weak room, the band count stops mattering for the link between nodes, because that link is no longer wireless. Among these seven products, only the Deco X55 product page explicitly documents Ethernet backhaul as a supported alternative to wireless backhaul between units. Each X55 unit carries three Gigabit ports.

The other mesh kits list ports without a retrieved statement about backhaul mode. eero’s support page lists two auto-sensing 1 GbE ports per 6+ unit. Google lists two Ethernet ports per Nest Wifi Pro point at 1 Gbps. Netgear lists three 2.5 Gbps LAN ports plus a 2.5 Gbps WAN port on the Orbi 770 router and two 2.5 Gbps ports on each satellite, the fastest ports in this comparison. Whether those ports can carry the inter-node link is a question for each manufacturer’s documentation; the Deco X55 is the one where that answer is already on the product page.

The extenders are a different case. Each has a single port intended for wiring one device in the extended room, such as a TV or console. On the RE605X and EAX15 that port is Gigabit. On the RE220 it is 10/100 Mbps, which TP-Link’s datasheet lists as Fast Ethernet. A wired device on the RE220 is therefore capped at a tenth of the port speed the other two extenders offer.

One network name comes with a condition on the extenders

Walk from the kitchen to the weak bedroom and the question is whether your phone follows automatically or has to be told to join a second network. All four mesh kits keep a single network name by design: eero through TrueMesh, TP-Link through its Mesh Technology on the Deco X55, Google on the Nest Wifi Pro, and Netgear across the Orbi 770 router and satellites.

The three extenders attach the same promise to a condition. TP-Link’s RE220 and RE605X use OneMesh, which forms a single-SSID mesh with Smart Roaming only when the router is on TP-Link’s published OneMesh compatibility list. With any other router they operate as a separately named extended network, which is the setup that makes you pick a network manually when you change rooms. Netgear markets the EAX15’s One WiFi Name and Smart Roaming as working with your existing WiFi router generally, and the datasheet retrieved cites no compatibility list. That is why the EAX15 scores a point higher than the two TP-Link extenders on roaming: it is the one of the three whose single-name claim does not route through a list you need to check first.

If your router is already on the OneMesh list, the RE605X gives you the single-name behavior with Wi-Fi 6 and a Gigabit port in one plug-in unit. If it is not, the EAX15 is the extender whose claim does not depend on it.

Match the generation to the router you keep

An extender joins the network your router runs, so its Wi-Fi generation caps what the weak room gets regardless of the router. The RE220 is Wi-Fi 5, AC750 class: 300 Mbps at 2.4GHz and 433 Mbps at 5GHz. Put it behind a Wi-Fi 6 router and the weak room is a Wi-Fi 5 room. The RE605X and EAX15 are both Wi-Fi 6, AX1800 class; TP-Link publishes the split as 574 Mbps at 2.4GHz and 1201 Mbps at 5GHz for the RE605X, and Netgear lists the EAX15 as 4-stream. Both list WPA3 support.

The mesh kits bring their own generation. The eero 6+ and Deco X55 are Wi-Fi 6 AX3000, with the Deco’s 5GHz band rated at 2402 Mbps using HE160 and the eero listing 160MHz channel support. The Nest Wifi Pro is Wi-Fi 6E AXE5400. The Orbi 770 is Wi-Fi 7 BE11000, rated up to 11 Gbps combined across six streams. Two limits apply to the newest two. The 6GHz band on the Nest Wifi Pro only reaches client devices that are Wi-Fi 6E capable, with older devices falling back to 2.4GHz and 5GHz. The Orbi 770’s Wi-Fi 7 rates and Multi-Gig ports need client devices and an internet plan able to use them.

When one plug-in unit is enough, and when it is not

A single extender is the right scope when three things line up. The weak area is one room. The devices in it are few; the RE220 is rated for up to 20, and TP-Link and Netgear publish no count at all for the RE605X and EAX15. And you either own a OneMesh-listed router or are willing to accept a second network name, unless you choose the EAX15. Under those conditions a plug-in unit is the smallest purchase that addresses the problem, and each of the three ships as a single unit with no multi-pack offered.

It stops being enough in three situations the specifications make visible. If the weak area is two rooms on different sides of the house, one plug-in unit covers one of them, and none of these three sells an add-on or multi-pack. If the room will carry a TV, console and several phones at once with no cable, every extender here is dual-band and relays on the bands it serves. And if you want to know the rated reach before buying, no extender here publishes it.

Sizing a mesh kit to one or two rooms

The mesh route does not have to mean three nodes. The Deco X55 and Nest Wifi Pro are each sold as a 1-pack, 2-pack or 3-pack, with additional units sold to extend coverage later, so a two-room problem can start with the 2-pack and grow only if needed. The eero 6+ 2-pack can take further eero 6+ or compatible eero units, and a single-unit listing exists separately. The Orbi 770 at this SKU is a 3-pack only, one router plus two satellites, with extra RBE770 satellites sold separately. For a household with one or two weak rooms, that is more hardware than the problem calls for, which is why it scores lowest here on kit size despite the largest coverage figure and the fastest ports.

One more scoping point. The eero 6+ 2-pack is two identical units and eero states either can act as the router, so the kit can replace an older router rather than sit beside it. The Orbi 770 3-pack includes a dedicated RBE771 router. The extenders, by contrast, require the router you already have.

Device counts, and the two that are missing

For a dead-zone room the device figure matters less than coverage, but it is worth reading the way each manufacturer states it. The Deco X55 publishes the highest figure, connections for over 150 devices. eero publishes 75+ for the 6+. Netgear publishes up to 100 concurrent devices for the Orbi 770. Google publishes two figures for the Nest Wifi Pro: up to 100 connected devices per router on its specification page, assuming a 1 Mbps-per-device baseline, and up to 300 devices for a 3-router network in retail marketing. Read the per-router figure as the one that applies to a 2-pack.

Among the extenders, only the RE220 publishes a count, up to 20 devices. The RE605X and EAX15 publish none. For one bedroom with a TV, streaming stick and two phones, 20 is not the constraint; the unpublished figures on the two Wi-Fi 6 extenders are scored low here because they cannot be checked, not because either unit is known to handle fewer.