Personally that I did not dare to trade on an exchange that was still untrusted, it was because some time ago we had heard that there was an exchange that ran away all the coins of its users. That is a serious thing because it will affect our future. For me, exchanges like Bittrex and binance are the most appropriate choice. Both have a good reputation because they have a good track record and have the best security system. It doesn't matter if an exchange applies a high fee because for me convenience is a top priority.