We are in a basement flat, one one level, built with thick stone walls, so I have a Pi3 which runs Hass, Mopidy and snapserver & client wired into the modem. I use powerline adapters for the other rooms with a wifi access point at the end of it. I couldn’t really say if I get more gapping with wifi or cabled.
In my daughters modern house, with thinner walls and on two levels everything runs wirelessly from the hub in their hallway. I’ve not had any complaints from them about gapping and not noticed any when I’ve been there.