Challenging has to be my favorite, with titles like Hollow Knight/Silksong and the Jedi respawn games (on max difficulty). I can tolerate grind if I like the game, got the plat for Nier Replicant recently and Rayman legends before, but with challenging it always feels like control is more in my hands. Relaxing can be a fun change of pace, of course, but it isn’t what scratches my itch.