Funny this showed up, I was playing this past weekend with some friends, we lacked a third GC controller so I used the pro controller, it was so jarring to use vs a GC controller.
I haven't played Smash with a GC controller since Melee. I liked using the Wii Remote and Nunchuck, but now I use the joycons with the joycon holder thing.
I didn't even know you could get a GC controller for the Switch. Is that better to use?