Least favorite has to be a tie between switch joycons in general and the circle pad on 3DS.
Joycons on their own are too small to be all too comfortable disconnected and connected they’re slightly better since I can position part of my hand on the back of the switch, so there’s at least that.
And with the 3DS circle pad, it’s just nowhere near sensitive enough. Movements feel too quick, with little to no control over how far the pad move, in my opinion.
As for favorite, I’ll say that in general I absolutely hate track pads and everything they stand for, but steam deck is the only exception. With most track pads I’ve used recently outside of the steam deck, I have trouble clicking since the mouse buttons are built into the track pad and half of the time feel like they don’t work. Though with the deck I find it real easy to just click pretty much anywhere on pad and it’ll click for me.
Only problem I’ve had with deck pads is that sometimes the click is a bit too sensitive for me, so I’ll sometimes accidentally click while on the onscreen keyboard by accident or click while playing a game like Gemcraft, making me deselect a gem or power up while dragging over.