relevant? sure. i've never used either for my own network, but have played with a variety of TP-Links, and still have a tapo plug (mainly for checking/monitoring power use of my christmas lights during the season (and also to reset those Twinklys when they had less than stable firmware).
WiFi 7... how many devices do you have that support WiFi 7? kung ang WAN connection mo ay less than 1000 Mbps, at wala ka ring local server/NAS ay di mo rin masusulit ang WiFi 7 AP/AIO.
sa dalawang pinagpipilian mo, one is AX1500 (AX12) and the other is AX3000. if you have devices that support 160 MHz b/w, you can go with the MR80x. mapapansin mo ba? kung wala kang local server/NAS, babalik ito dun sa WAN connection mo, i.e. malamang hindi kung less than gigabit and connection mo.
also note that Mercusys is a subsidiary of / brand owned by TP-Link. i haven't done a tear down, but i suspect they share a lot internally.