Buy 3+ holsters until you figure out which one is right for you like the rest of us
Some people are down on hybrid holsters, but the possibility of the soft material wearing exists with leather holsters too. You just need to be ready to toss a holster when it's worn.
I'm fine with carrying my M&P Shield AIWB in a straight kydex holster, but I'm a lean guy who doesn't sweat very much. A ton of holster preference is dependent upon your own personal geometry. Oh, and a good gun belt becomes very important when carrying AIWB.