There is obviously a difference in performance between a thicker and a thinner belt. I prefer to press in the one-ply, and a guy who's not used to a lot of belt might prefer to do everything in it. The two-ply belt is a very nice piece of workmanship, and I squat and pull in it. Both will age with the lifter into a very personal piece of equipment. If you haven't got the money, I understand. The two-ply is the nicest belt on the market, but it's not priced for everybody because it's made of very expensive leather.
I prefer a natural leather belt. That's why these are made they way they are.