I luuurrrrve the second one BUT when I went to try on dresses, I found that I didn't like the way ones like that actually looked on me So if it was me, I'd actually probably prefer the first one on.
Very hard to choose a favourite as they are both really stunning and I think it would depend on how they look on. Very personal comment (and an honest opinion) but the first one has more detail on the hips and bottom area so if you are slightly larger in that area, it may emphasis it...this may not be a factor for you.
Oooo they are both lovely! Initially I thought the second one, but I think I actually prefer the first one. Love the drapeyness of the skirt, and prefer the angles of the top layer on that one rather than the second one (iyswim!).