I hope this helps some of you! There is a spread btw those 2 exchanges, maybe others but you can get more if you use Bittrex to login and sell right now, I checked both!
Interestingly, the volume on BTRX is about 22x less than Polo WRT this currency -- but it is still much higher. Could be several reasons for that - certain whales on their trading, algo's..... etc.