Just go with the one who is providing you most of the volume and good UI! And such exchange could be Huobi, Binance, Kucoin etc. They are getting popular day by day and the goodness is unspeakable for them. I am not giving overwhelmed response about them but they are the who has come in the market recently but have broken apart other top 3 platforms in the crypto world. I think you will find most of your coins over these exchangers and can enjoy the benefits. Binance and Huobi app is mots interesting one and very handy to use.