Serena Williams, Monica Seles, Berdych are known to use big grip sizes (4 1/2 with overgrips and 5/
. They hit flat and muscle the ball at times.
Pros like Nadal and who whip the ball like the smaller grips.
I hit very flat on both sides and prefer 3/8 or 1/2 with overgrip and have small hands. I hit for 1 month with 1/4 and had a lot of wrist pain.
My personal opinion is that also with handle shapes of Head and Volkl you need a small grip size, but round ones like Wilson and Yonex you can go bigger.