It depends on the game but I always try and play on normal/medium difficulty. I find with hard modes in a lot of games the enemies just become tankier/grindier and that's not what I want from a harder difficulty mode. I think enemies and bosses should have different attack patterns etc rather than just dealing more damage and having longer health bars.

Final Fantasy VII Rebirth and Final Fantasy XVI.

I love them. The first one is my favourite, I have played through it three times over the last several years and everything about that game brings me joy.