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I just recently published post about best options available to trade coins:

https://steemit.com/steemit/@alex13/shapeshift-vs-exchanges-best-options-to-buy-sell-exchange-your-coins

Basically it depends on the amount and specific pair of coins. In some cases Shapeshift provides better options.

Don't see Steem and Steem Dollars on the chart. I am not a trader. I just use them to convert some of my posting earnings to fiat. For that shapeshift seems very expensive. Like going to an ATM that charges me over $6 (as that is low) for a withdrawal.