I didn't like Sunshine very much. It lacked innovation and, to a notable extent, a learning curve. Not that it was bad, but I just felt a little disappointed in the result of it. Galaxy, on the other hand, revives Mario and brings new light to him.
I'm certainly no graphical buff, but if you have a fully upgraded PC and don't care much for achievement points, you should definitely opt to purchase the PC version. I personally don't currently have the money to purchase it, but once I do, the first thing I will get will be BioShock.
connell66's comments