What’s being recommended is a ‘Sky Q router’, the SR203, which you can more or less directly swap in for the Now router, doesn’t need any reconfiguration, and has WiFi which is rather better.
You can pick one up off eBay, or possibly Gumtree or your local equivalent.
Keep the Now router to swap back in if you ever have to call Now Broadband about a problem.
The Sky Q hub is exactly the same as the Now router, except for "badging".
The SR203 replaced it, mainly I suspect, because it had a terrible reputation for poor Wi-Fi.
So yes, try and get an SR203, it should improve your Wi-Fi experience no end.
My account recommends a sky Q to improve broadband coverage in home.
Where in your account does it say that?