Most of the time there difference of price exists so do you withdraw bitcoins from one exchange and sell at higher rate exchange?
All exchange has the individual value of their coins, and it is not ever the same to the other exchanges. I dont trade at multiple exchanges but I already try it I know that excellent idea, but I dont like because it makes me more distracted. Sometimes I forget which exchange I use that coins. I only do the trading on the poloniex. I am very comfortable in the poloniex and give bigger returns