Would really be random because price gaps could really differ on each exchange platform which means that it would be talking about different coins depending into those price gaps
but the big question on here is if those exchange are reputable or known enough for you to deal with? Come to know that there are platforms who do locked out funds from those
people who do tend to deposit or some of them ask out some kyc before you could withdraw or some of them do have wallet maintenances which would result into delay of such
transactions in between platforms and these opportunities do comes fast thats why time is crucial.