For me, the best decentralized exchange is Poloniex because of their good policy and privacy to each of members. But for now they are requiring valid id for the new comers to ensure to proper use of the said exchanges
I want to upset you, but Poloniex is not a decentralized exchange. Decentralized Exchange is something like etherdelta)
Poloniex is a regular exchange like bittrex binance bitfinex
Also I've heard something about Poloniex. I wonder is it true that Poloniex is crashing? Most people said that its just a piece of scam now. I really hope that it isn't since Polo was once my favorite exchange .