I just choose the exchange that have a large liquility like Binance, Huobi, OKEx, Kucoin... Choose the right exchange is very important because your asset in it and the good exchange will help you earn money and keep your asset. Remember, dont deposit in exchange that you dont know or there too risk because you can lost everything that you have. The order of the exchanges is as follows (in terms of safety as well as liquidity):

1. Binance
2. Huobi
3. Kucoin
4. OKEx
5. MXC