As @moore_94 has said, have a look through the titles on both PS Premium and Gamepass, see what suits you more. I'd take note of the various companies being brought by both - so Bethesda, AB etc and the type of game you enjoy playing.
I also thought Bethesda games will be on gamepass.
Fwiw I really enjoy the plethora of games on gamepass, having big titles and then a tonne of older and smaller games is great for me.
Fact you've posted this in the PS thread has me thinking you've got a good idea to what you want anyway.
Honestly don't think it's a huge difference whichever you buy.
Both have big game titles, both great consoles to own and you'll lose hours playing whichever way you go.