Covering With Aluminum or Filon??? Opinions Needed

Hey Guys,
Not that I am ready to apply my outer skin on my Teardrop, but just wondering some of the in's and out's of using aluminum or filon. Which is cheaper????
If you would choose aluminum, What thickness would be best on a teardrop??? Need some good links to suppliers too. Any help much appreciated.
Not that I am ready to apply my outer skin on my Teardrop, but just wondering some of the in's and out's of using aluminum or filon. Which is cheaper????
If you would choose aluminum, What thickness would be best on a teardrop??? Need some good links to suppliers too. Any help much appreciated.