Personally, I've always been a fan of her golden age costume (the first one) due to the poofy sleeves (:P) and it would probably be the most recognizable. But I'm also totally digging the mini-skirt and belt for the second costume linked and I haven't seen that one done before (at least not in person). I think the major deciding factors here are:
1) Fabric: which type of fabric do you feel more confident working with?
3) Your personal comfort level wearing the costume
Most important, which do YOU like better?