I have played with leather grips (without an overgrip) since back in the early 90's. Fairway has always been, in my opinion, the best available.
Since Fairway have more or less gone away, I prefer the Tennis Warehouse private label ones. I've tried:
Pro Kennex (good, but can't buy anymore)
Babolat (didn't care for, too slippery for me)
Wilson (good)
Luxilon (great grip, but can't buy anymore)