Don't interrupt my video with ads. Play before or after. Ideally after, but I can see why that would not be feasible. I guess it is also feasable if the creator marks ad breaks, like the current-day sponsor segments.
FYI ad placement and type is decided by the creator not youtube. If you see a video full of ads in the middle it's because the creator of that video chose it to be so.
I've had a lot of different setups over the years on my TV to see if my family (all "what's a computer?" level of computer illiterate) could get the hang of it, and the one that clicked for all of them was Stremio+torrentio. Pop in a debrid service to avoid downtime/buffering issues and they've never complained since.