Personally, I really enjoy LibreTube (Website, F-Droid link, GitHub). It is great for privacy as it proxies all traffic to YouTube through a Piped instance meaning you don't have to connect to YouTube servers and your identity won't be exposed to Google.
NewPipe (Website, F-Droid link, GitHub) is another good option, but it makes direct requests to YouTube. There are also forks of NewPipe like NewPipe x SponsorBlock (IzzyOnDroid link) which just adds a SponsorBlock integration and there is BraveNewPipe which has support for more video streaming plattforms.
Clipious (F-Droid, GitHub) is a pretty new app that uses the Invidious API to privately pull content from YouTube. I haven't tried it out though.