Hand size shape, and dexterity are all over the place. A lot depends on what works for you. And that can depend a lot on what you've grown accustomed to using.
I built a number of AR's for military contractors a couple of decades ago. To my surprise, quite a few of them opted for the old A2 grip. When asked why, the reply was the same - It was what they were familiar with.
There have been a number of much better grip choices brought out since the original AR' made its debut. We have companies like Magpul, BCM, Ergo, Tango Down, Reptilia, and a number of others to thank for that.
When David Tubb first brought out the original Tubb 2000 rifle, it incorporated the Sierra Precision Rifle (aka "SPR" - copyrighted by someone else - Armalite, I think?) grip, originally designed for target shooting with the AR'. It's a severely "Right-Hand-Only" design, but what a good one! It's like having "power steering" on your weapon, IMO.
https://www.brownells.com/gun-parts/rifle-parts/rifle-grips/ar-15-spr-handgrip/
I use it on a number of my AR's, because, 20 years later, it's what I can say I'm accustomed to using. At one time it was standard issue on Israeli KAC SR-25's. I've sent bushel basket size orders of them to Little Creek. But, it's still a relatedly little known design.
With the increased understanding of the need to employ precision rifles in an ambidextrous fashion, grips to accommodate this are required. One good example is the Ergo Tactical Deluxe Grip:
https://www.brownells.com/gun-parts...ergo-tactical-deluxe-grip--suregrip-ad20115c/
Not only is this a popular choice in custom AR' precision rifle builds - It is also standard issue on the Accuracy Int'l AT-X: