If I had to pick one I'd go with the white one - I'd feel sexier with the greek-goddess look, personally. But they're such polar opposites that I think it'd be *great* fun to get both, and switch in the middle.
While a filmy white gown is attractive, I think I'd go with the sexy black set.
Though, it really depends on your preferences and what your partner will like.
Totally depends on the look you're going for. Personally, I would prefer something more sexy, but I know for my body type the bra on that set wouldn't look good at all. The gown is a bit more forgiving for me personally.