neoprene vs. nylon vests

Hi, I'm new to wakeboarding (I just got an O'Neill Custom), and I'm trying to get all the right gear for the sport. I'm going to get a life vest, but I'm not sure which type is the best for wakeboarding. The neoprene ones seem to be what all the wakeboard sites carry, but they're also way more expensive than normal nylon vests. If anyone could tell me the difference between the neoprene and nylon life vests, and which one is better for wakeboarding, I'd really appreciate it. Thanks!