For 2D fighters it seems a lot more open, but Tekken requires more constant dashing / double tapping so I’m thinking a wineglass / 2 finger grip isn’t going to be energy efficient. Most players I see use the open hand grip, and it seems like they also get a lot more precision that way since the tips and insides of all their fingers to the work.
Yeah, I’ve noticed that especially for ball tops, using the tips and middle joints of your fingers increases input accuracy quite a bit.
The upper forearm also adds a good amount of precision if you can use force from there without jerking your hand and wrist around.
It’s individual. Play how it feels right for you.