Although decentralized exchange is good but right now centralized exchange like binance and bittrex is certainly better to use because of the liquidity and the fact that they are easier to use compared to decentralized exchange. Maybe people will start choosing decentralized exchange if they improve their platform and centralized exchange is becoming worse, but for now i will still use centralized one.
some users ( including me ) will still prefer to use decentralized exchange like etherdelta because they are also good aside form other centralized exchanges like the ones you mentioned above however it doesnt really matter on whether you choose centralized or decentralized because what matters here the most is the services that they offered.