If money isn't really an issue, go to IU, are you nuts? Forget stats for job prospects, I don't understand how people make such calculated decisions based on this kind of stuff, we aren't comparing Harvard and London Met here... just work hard and have a good time at uni, where do you think you'd be HAPPY? - that IMO is a more important question. Can't speak for Aberystwyth, but having lived in Bloomington for a decade, I can tell you that it's a pretty fun place for most students with a pretty solid international network especially for SPEA, Kelley and Jacobs.
But just for the sake of not totally sidestepping your question, the added benefit of going to IU for job prospects is the 'easier' (and by this I mean relative to not having done a degree in the states) access to the US job market as a foreign national if you're interested in that.