Also, is the PowerA GameCube controller any good? It does look intriguing to use.
They all work well. The only controllers I think would really hold someone back are the joycon.
GC controller stick has an octagonal frame, which is really good for smash, but has analog triggers, which isn't as good (shields used to respond to how much you depressed them in melee; not anymore). I, and I assume many others, use GC controllers because I've been playing this game on them since forever and just had a bunch of them lying around. If I were starting now, not used to any controller in particular, I'd use the pro controller. It's easier to find, you don't need an adapter, and it is much better for button remapping. I like having jump on a trigger/shoulder, which allows me to jump and do aerials with the c-stick without clawing, but L/R/Z all suck for that on the GameCube controller. The pro controller also has an extra shoulder button, which is nice.
