My answer to a similar question asked a couple of days ago https://helpforum.sky.com/t5/Broadband/Folks-who-had-the-standard-router-and-Max/m-p/4815385#M437745
Short answer: the WiFi Max router copes with multiple devices trying to use the internet at the same time much better, especially if they are WiFi 6 devices. The range and signal strength are no better though.
Lounge: Sky Glass gen 2 65” volcanic grey, Denon X3500H AVR. M&K K Series 5.1.2 speakers, PS5 Pro, Apple TV 4K, Sony X800 M2 4K player.
Bedroom: Sky Glass gen 1 43” dusky pink, Apple TV 4K.
