I have not really used a lot of P2P cryptocurrency trading exchanges. So far I’ve only been able to make use of two of the P2P crypto exchange and they are Binance.com P2P exchange and paxful.com. I think this exchanges has a few advantages over centralized exchanges. some of the advantages you are going to get in making use of decentralized/P2P exchanges is that you have to pay less fees when you are trading your coins, next is that there are lots of payment methods available on these exchanges. Apart from these I don’t think there are much difference between them and centralized exchanges.