I ride in a Smart Cinch Airflex. It's not my favorite though. It rubs a little if I ride for a really long time. Just a couple small places, but it still bugs me. I prefer woolback cinches. I've never had a problem with them rubbing, but you got keep them clean and debris free.
I have a neoprene cinch. Its okay, advantage : does not allow brush or stickers to stay on ,
Disadvantage : they seem to get sweatier / hotter .
The mohair or rope cinches breath better but I have seen them pinch some.
The felt helps with the sweat, but stickers love it.
My vote goes to either mohair or alpaca. I managed to snag an almost-new classic equine alpaca cinch for $15 at a tack swap. It's been through a couple of 10+ hour trail rides with nary a rub mark on my horse at the end of the day. I've seen the neoprene severely gall too many horses even after just an hour or two.