There is no one and the best cryptocurrency exchange. It depends on what you expect from your platform. Personally I can recommend
CoinDeal because it has pretty attractive trading fees. Moreover, it has broad variety of payment options and markets so you can also buy many altcoins there. What's interesting, you can purchase their CDL Tokens and these coins could lower your trading fees.
I think even if the trading fee is reduced There is not a single exchange on this trading platform Fewer people trade here. Binance is one of the most accurate in Bitcoin trading Here each currency is reliable with prices and fees are low.