I had to get a pistol and check to see, I didn't know what I did.
Anyway for me, I didn't see any difference in grip or finger placement between the two.
But then again. I do most of my pistol/revolver shooting with one had. When I do shoot with two hands its normally in competition where I use mostly a combination of the two, depending on targets and if I'm moving.
Main thing is go to the range and see. See what is comfortable and how you shoot. You're targets will tell you more then us guys on the internet.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071