Not only the best but for me the biggest crypto exchange at the moment but lately we are having problems with this exchange as our country the Philippines is planning to ban this exchange because of its failure to met the necessary paper works thus leaving us in limbo on whether use the exchange as one day out government might ban and our funds are still inside the exchange.
Binance is a very trusted exchange by majority of crypto enthusiast, but yet binance doesn't satisfy the needs of every body. when I was really into investing on different altcoins some years ago, I still remember that binance never had all the tokens and coins i wanted to buy and even till date binance doesn't have every coins that some investors might want to buy, so, some people still go on other exchange to buy the coin of their choice that is not yet listed on binance exchange.
For me, I know I started using binance exchange and I quite ejoyed their serving but at some point up till date, I started using binance mostly for P2P trade, that's selling to my local currency or buying Bitcoin with my local currency. Since I started future trading, I have always made Digifinex my best exchange, I just prefer it over binance.