We use Chromium.
We are currently using the Unreal engine version which doesn’t have H.264 codec, so not all videos can be played.
We were using the one that Valve provides, via their Steam browser, but a recent update to their browser now crashes on Youtube ads, forcing us to disable use of it. The Steam browser one has H.264 codec.
H.264 codec license costs a ton and is not something we can afford.