Flow by far

Best would be using Invidious or piped instance on a browser.

Second best is libretube or newpipe app.

Always on vpn, no Google play services, and one of:

New pipe / pipe pipe

Grayjay

Firefox (ironfox) plus unblock origin

Pipepipe to store the subscriptions and Seal to download the video locally with sponsorblock. No buffering and no ads

A what?

Grayjay

I’ve been using LibreTube and it’s the pure solid finest.

FreeTube has an android fork.

https://github.com/MarmadileManteater/FreeTubeAndroid/releases