Which one should have i picked?

Both of these dresses are from zara (select city walk, saket) I absolutely love that store you can find these in the first floor only

The occasion is my friend's birthday party, everyone is going for that black silky dress, i thought of trying something new, what are your thoughts or should have i gone with a black dress only?

P.s.- Got a lot of love yesterday for my post, i tried to reply to every single comment but still thankyou all so much 🎀