I'm a fan of forkdelta I have used it for several times buying some undervalued tokens there, there is something to work on the user interface because its not user friendly. The only thing you might dislike the decentralized exchange is that there is no USDT on it. You would have to be the most experienced trader to profit from the DEX is that is the case. Traders want profit, without the stable coin like tether, it would be harder for someone to earn.
You want to stay with BTC or USDT. In crypto Industry no one would like to go with the USDT for final level of convertion or holding purposes as I know people go with bitcoin or ethereum to hold and grow well with it.
Organizing the fund with the same value alone you may prefer USD. Then i would like to vote for decentralized wallet and exchanges since very flexible and no middle man in front of anyone.