I also recommend Bittrex because I feel the tranding there is safe and the volume there is not too high, and of course the coin that is already in Bittrex is a good coin, so we can choose which altcoin we will compete against right
I feel that trading on any platform is not much different because everything provides satisfying services for customers, precisely what must be prioritized is the purchase of altcoin which is predicted to rise in price in the near future.
Profits can be achieved if the altcoin purchase is right on target and correct predictions. To be safer, collect 3 or 4 coins from 10 large coins in the rank and HODL in the short term, and sell when profits are reached. Then, repeat this process and trade can become a livelihood.