Kucoin is a very popular exchange too, and they tried to be very smart is also playing a very nice strategy and the moment Binance planned to ban US citizens, they already took the right step to get some BNB coin listed on their site and I think it will be nice for anyone to try Kucoin out, seems they are very reliable, but I don’t know the issue you are having with coinbase, coinbase is also reliable and the fact they operate from United State makes it a plus for you in case you are from there.