What To Wear: Anthropologie vs. Anthropologie

Ryan and I are going to a wedding on Friday for one of his college friends. I'm currently debating between which outfit to wear to the occasion: On one hanger (get it, get it..?) I have this cream/striped dress I got at Anthropologie (over a year ago and still haven't worn) and on the other hanger I have a polka-dotted strapless number I also got at Anthropologie.

Now here is what I'm thinking.... I should save the dress with the cream and the stripes upcoming wedding functions with Ryan's family because it is more covered and I should rock the strapless dress for the 20 somethings wedding where I will only know Ryan's friends. Agree, disagree, agree to disagree?