Are you guys looking for the best rates in the market when deciding to buy/sell Bitcoin or you're bond with the certain exchanges where you have an account?
At first I want to mention that I amn't expert trader and for me no one is expert because trading is halfly luck too.
In your case, it depends on situation cause if you really have great deal, why to miss it? But in overall I'm bond with certain exchanges because deals on arbitrage trading isn't really good and personally I prefer to catch great moments rather than every moment.
I bond with certain exchanges cause I don't withdraw money from exchanges very often (a little bit lazy and hate fees) and because of this, security means a lot for me.