Of course, as Steemians it is best to use BlockTrades to buy/sell Steem/SBD but we cannot compare it to Binance and others.
I am using several exchanges because some coins are not available from one exchange but available from another exchange.
When I first heard about Synereo AMP it was only available at Poloniex and Bittrex. Then only Poloniex supported Burstcoin. I like Poloniex but there are coins that are not available there but available at Binance.