I have to say, both as a horse owner and a tack store owner, it really depends on the horse.
Many many of my customers like neoprene, and many horses go well in them. But I have two that rub and gall with neoprene. Those two get woolback cinches.
I prefer the roper style, broader in the center, to the straight cinches. Mostly because it spreads out the pressure more. All of my horses have cinches with elastic ends so they can breath a bit.
But honestly, I carry a huge variety because it is so individual, both the horse and the rider.
And here is a photo I have up in the store to help with girth length.