My personal lead is Binance, over the past 2 years of operation that proved it. In terms of trading volume, liquidity, customer service, security ... Binance has always been my top choice in trading. Next can be Huobi, Coinbase, Okex, Bitstamp ... However, Binance DEX may soon be the best quality exchange, because this is a decentralized trading exchange, users can control all their own assets. And the decentralized trading exchange is the future and trend of the Crypto market in 2019