1 Huobi. Advantages: Website easy to use, update many pairs of trade altcoin, token, fast transaction speed.
 Disadvantages: High transaction fees. Sellers and buyers are required to pay a fee.
2 binance. High reliability, good customer service, over 100 different types of altcoins and tokens, Multilingual support, 1.4 million transactions per second, Supported by a professional team in the financial and crypto markets, transactions and withdrawals at low cost.
Disadvantages: Some users are delayed when withdrawing from Binance. Because this is a new platform, it is difficult to assess its long-term viability. Currently only China's phone number is supported by two-factor authentication. Binance collects and stores some user data, such as IP addresses.
3 bittrex. Advantages: High level of security, Easy to use, Integration of some features automatically.
Disadvantages: The process of verification is difficult and time-consuming, Slow response to issues related to customer service.