I'll controversially say that I really love the Steam controller. Not the steam deck (which is honestly my number 1 if we're including handhelds) but the original controller intended for use with the steam link device.

It really just needs a right analog stick and it would be great. The lack of one takes it from 10/10 to like a 7/10. It's so good otherwise, great weight and size, good design. Sensible layout and the big track pads work really well! It was clearly a prototype for how the Deck layout ended up, though I actually like the controller's big circular pads more than the decks little square ones.