I found out that Kucoin is good but still not satisfied. I need a new exchange because Kucoin always delaying some trading coins. Anyone can help me out. What do you think is the best exchange to choose?
I'm guessing that what you need is an alt coin exchange because you had problems with Kucoin.
Binance is obviously the one to go with, here. You get 2 BTC unverified per day worth of withdrawals which is similar to what Kucoin offers to unverified traders. If you are able to be verified, then even better, although that is obviously not required.
Another exchange that I would recommend would be shapeshift. Even though you may be getting around 2-3% worse than market spot prices for your coins, I think that amount is worth the convenience and the peace of mind.