I need your HELP! Which dress should I mess?

Okay below are pics of the two dresses I have to choose from. Both will have to be altered to fit me and make it so I can run in them. I'll be doing the altering so it will be a frankenstein experience for sure.  I'm looking for input on which dress I should use. Please comment with you choice and stay tuned for the winner.  At the moment I'm going for the pink (though straps will have to be added).