what do you want to see? Volume, low fee? I will suggest poloniex, bittrex and bnance like everyone else did because these trading sites really have huge volume per 24 hours which make you can earn faster just by actively trading it. Mean while if you play on some new site, you will get benefit by controlling the market as well because of you are huge trading but you will slowly gain this moment when you are controlling them. So I can suggest that you will choose the one with really huge volume if you are good on trading and actively trade well. But if you think this as your second income then you do not really bother where you are going to trade, as long as it gets profit