Hypothetically, would you rather have wings on your ankles, or on your back. Both sets of wings will give you the same amount of flight. My friends and I have spent many a drunken night arguing this dimwitted notion...
Which ever would be the easiest to grab ahold of to rip them the hell off. I can't stand a watch, glasses, damn near anything 'extra' born without wings to start so I umm well can't imagine anything 'extra' being added..
Is say back, when I have them on my ankles my jeans won't fit anymore. Oh... but when I have them on my back my shirt doesn't fit anymore. hmm... Hard question...
Angel in this summer's X-men 3 had wings on his back. In the comics, the static image, this worked and looked cool. But in the movie a human figure with wings just didn't seem to move right. Still, better than Brian Blessed in Flash Gordon the Movie.
I want them on my back so at Halloween time i can dress up like an insect and disguise the wings like bug wings and fly around annoying people...LOL Of course, it would suck if the wings actually looked like bug wings.