Such exchanges as Poloniex, HitBTC and OKEX I don't like. Poloniex did not verify me for 7 months, I stopped writing letters to them and forgot about this exchange. In early 2018, OKEX did not have a translation of the support page in languages other than Chinese, which was a huge problem. On this exchange, I also could not be verified and after 5 appeals I abandoned this case. About hitbts all probably know what kind of exchange it is))))
Poloniex already lost the spot a long time ago and is gradually turning to a shitty exchange that no one really cares about until further notice. The have refused to stay ahead of their game, things just keep deteriorating, support keeps getting bad, the platform keeps lagging and so much more.
Right now, binance seems to be the top notch for me in terms of volume, fees and security. It offers almost everything any trader would want from an exchange. So, I do not see any reason why I would want to settle for less.