I adore the second one, as imo, the first one looks a wee bit like actualy underwear. But the second one looks as though it'd be incredibly flattering as well, as i mean, i don't know what you look like, or how you feel about your body, but the first one would totally draw a tonne of attention to your arse! And would possibly rip off. but then, i'm the sort of girl who surfs and goes rock jumping in my bikinis, so that probably dosen't matter... lol!