Lately it's been Persona 4 Golden on the Vita and Zelda ToTK.
Zelda because you can change your play style easily, sometimes I just want to build stuff, other times I want to explore the map, fight monsters, or do side quests. Sometimes I'll sit there and spend a bunch of time preparing meals for a future play sessions.
Persona 4 I keep coming back to for the story and overall experience - music, voice acting, and even just navigating menus is so stylistic and top notch. I started my playthrough in 2019 though and am barely picking it back up.
On days I have more energy I've been playing Freedom Planet 2 for some action platforming as well.