I've tried out bittrex but I don't really like it. I used Changelly and the process was fair, fast and pleasant. I prefer Changelly. ShapeShift has also recently added the Steem currency but it's still unavailable. I expect them to add SBD there as well. I think ShapeShift will be a great way to trade when it becomes available. my final options will be between Changelly and ShapeShift