I love both! I have one very similar to the first, a pink one from VS, and I think it is perfect for summer time! Like dot said, I think it can go casual or dressy. And I think a girl can't have too many dresses for summer!
I prefer the first one - the colour will look good on tanned skin. If it's the newer Cool Change, I have the older one and you can wear it as a skirt or a dress - the skirt option is v. cute.
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"Don't be cool. Cool is conservative fear dressed in black. Don't limit yourself in this way." - Bruce Mau