Easily hands down best out there is binance. If you use binance's own coin bnb than you get amazing low fee and it has huge volume and it has gone thru a lot of troubles without ever giving their customers any of the trouble. Binance has done EVERYTHING properly, great security, great trust, great support, great fee, great volume. You can find anything you want there and still they can manage to give you something you did not know you wanted. I also love the affiliate thingy because I had couple of my friends start an account there and made money from that too, which is something I did not know I wanted from an exchange but when I saw it I knew I love it.