I love them both, but you're right, I do favor Jared/Sam. I figure you can't have one brother without the other, so being so pro one to the detriment of the other is silly. That said, it's natural to relate more to one (I'm a youngest sibling, consider myself an intellectual, and am more reserved, so took to Sam pretty quickly). If it were only Jensen going to the con, I'd probably be less excited than with just Jared, but I really would love to see J2 interacting in person. I've watched a bunch of convention videos of them and they are absolutely hilarious (and beyond adorable).
... I have a problem =P