In my opinion, Poloniex is one of the big Exchenges currently in the market that has a large amount of coins and tokens in its portfolio to negotiate. And its platform, although I find it a bit heavy, is quite easy to use. Another positive aspect and the great movement of negotiations, this is logically due to the fact that we can negotiate different types of currencies and tokens in several negotiation pairs. I think yes, Poloniex is one of the big ones, it's no coincidence, I hope it stays that way, and that new coins and tokens are added to your trading portfolio !!