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What makes polo better than bittrex in my opinion has a whole lot to do with responsiveness and reliability.
I've had tickets on polo that were answered in less than 10 minutes. I don't recall bittrex answering my support ticket in less than 3 days. These aren't particularly complex tickets either. More like "Hey I made a deposit, it's been hours, where's my money?" that are basically the norm for every exchange.

Polo also has better volume and orderbook depth than bittrex usually.

Thanks.

On Poloniex are 10 times more traders than on Bittrex... you will see the volume in a couple of days...