I never (sometime i use) used KuCoin but people saying that they have high fees in compare to other exchange sites
I am using cryptopia from last many months but never faced any problem with them. They are good but listing fees are high according to their status.
I suggest to use, Binance, HitBTC and Bittrex (they have complaint too but minors) HitBTC and Binance always adding new Tokens and coins and Bittrex are one of the trusted US exchange site which add only unique coins or tokens at free of cost.
Different traders have differences and preferred features of an exchange. Binance is ok and it's very popular today, whenever a coin starts to be listed there it gets pumped.
It shocked me when someone posted that listing a coin on binance costs 400
BTC in total and that approximately $2.5M.
I stopped using bittrex few years ago and never went back on it, different experiences and problems encountered to these exchanges so what do you prefer now op?