I have been trading in the cryptocurrency market for 4 years. The first cryptocurrency exchange bittrex I used was and I still use it. New referrance feature and the ability to buy coins with credit card is very good. Apart from that, the credit balance gained with trading and used in transaction commissions is a feature I like very much. I like the stock market because it is simple and has many good coins or tokens. Trading volumes are quite sufficient in good cryptos such as bitcoin, ethereum, litecoin. It doesn't worry me about security at all. In short, one of the few exchanges in can be used is Bittrex.