If the roles were reversed and Jensen is Sam and Jared is Dean who would do a better as that character!!!

It would be awkward...
I don't think Jared could be all badass like Jensen's Dean and I don't think Jensen would make a very good geekboy, he doesn't look geeky.

Yeah, they'd be good, but I like them the way they are. Dean with an eternal puppy face? Cute, but it doesn't fit the character as well. And being a sasquatch geekboy is just so adorable. Nope, I like them the way they are. :)

I love them as they are now, but It would be interesting to see them in changed roles. But ffor one I'm sure no matter which role they play they would be good anyway.

I think Jensen would play a pretty good Sam, I think he had originally auditioned for that role in the first place =)