Originally Posted by
alexheney
One account on multiple devices only really works if the devices are all android or all iOs.
You can switch between Google Play and Apple Game Centre, but not easily or particularly quickly (and not sure how many times it can be done), whereas opening it on a second device of the same OS is just a case of opening it :)
Multiple accounts on one device is also possible, and while not supported, is NOT against the TOS, and in practioce works well (at least on Android, I have no experience of iOs).