Huobi and Okex are now the only exchanges that are left that is continuously giving good rois. You can also add Kucoin if you are only a risk-taker because it seems like they are back in the game after their last IEO tokoin that has given good results despite of its big supply. But with those 3 that I mentioned, Huobi is where I will put my money because Okex are all just fake volume and wash trading. And Binance has so failed IEOs that I would not recommend for anyone to join their IEOs or it will be their losses.