You're really going to have to try setups and motions until you can find a grip where you can do them all without switching grips.
Certain grips let you backdash/forward dash easier, but you won't be able to IAD or something.
IAD is most important, but what if it's hard for you to input a certain direction holding it that way?
You're basically gonna be like for a few weeks until you find a happy medium.
I personally put my thumb almost on top/right side of the ball, and.. ahhh I'll just take a picture while I'm holding it to show you my grip, I'm about to go play some GG for a few mins anyway.