Silver. The driving position is better (due to the recaro's and the reach adjustable wheel which you don't get in the cup). Nicer steering wheel too. It'll be as good to drive as the cup, as fast, and more comfortable. Coming from a 182FF the cup interior will feel sparse, albeit better built.
I also think it looks great in silver, and the white will drive your cleaning ocd mental! Cleaned mine few days ago, already filthy. Not seen any silver one's about, but plenty of white one's.