I have been using poloniex for a long time, the platform is very easy to use, although they had the same interface for a long time, it has already been renewed, which gave it a more current view in relation to exchange. poloniex has already gone through several owners in all of this type, but it is still a fairly solid exchange, and quick to use in what appears to be, it has a relative variety of cryptocurrency, (at least the most used in the market) but they are still a very friendly interfaceSee full review