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Bittrex is definitely a better choice. Polo was accused of stealing user coins, and not responding to support tickets. Some people even lost thousands of dollars in coins, I would switch to bittrex asap but it's up to you. Good rule of thumb is to only hold your coins in your wallet, not on an exchange.

Thank you for the tip. I just moved my coins to my wallet and am going to use bittrex from now on.