What the hell is "Aurora Portable"?
As far as I know, Steve has only ever made two versions of Aurora: the old VB6 version and the new C# rewritten version. Both of these are PC-only and neither as far as I know is terribly portable, although I do think a few brave fools have tried to make C# playable on a tablet.
This being said, the answer to your question is obvious - you should play C# as it is the latest and greatest in space logistics simulation technology.