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When you finally get your Steem flowing in, Bittrex is the best for moving Steem/SBD into BitCoin to start trading. Just a free transfer up to Bittrex and then you can sell it at your price.

Cool! I was on there last night getting familiar with the platform. I also transferred my holdings from Coinbase to GDAX - was happy to see the free transfers - and toyed around a little with some limit orders.

I think, if I were to have the best options, it would be Bittrex user interface, with Binance's connection and coin promotions.