I will prefer to use binance right now as right now it is a best exchange and there are many people in that exchange. Always keep in mind that trade on that exchange which has a high amount of traders so that you can easily buy and sell any amount without any hurdle or delay. Kucoin is also a good exchange and you can trade to get a good profit but right now keep the amount of trade lower as the traders are not that much and with time it is hope that the users will increase.