Prom Dresses...

Okay, so I am kind of stuck. I can't decide on which prom dress to get. I started with 4 that I liked, but then I narrowed it down to 2, mostly based on general preference, but kind of based on price aswell.
The two that I've whittled it down to are £45 each so it's not as if one wins with the price. I sort of have a favourite, yet other people keep swaying me. I want some other people's opinions, even though I think my mind is made up already and I probably will dismiss your opinion if it's not what I want to hear, haha. Anyway, here are the dresses;

My favourite is the one on the left; I like the chest part. I know it's not very prom like, but oh well, I'm not going to get some stupidly expensive dress in a ridiculous colour that looks terrible. I'm going to get a cheap-ish dress, in simple colours that looks nice. And here is my answer;
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Chic, Affordable and Sexy. Bravo.