I can spot a teeny bopper singer a mile away. Know why? Because I DESPISE that type of music with every bone in my body (ala David A.) That said, I don't have Kris pegged as a boy band singer at all. If you listen to some of the contemporary pop singer/songwriters such as Jason Mraz, Ryan Adams, even John Maier, that is what I most compare Kris to.
This is the first year ever that I sincerely like both in the top 2. Adam is more talented vocally. But then again, Adam is more talented vocally than most other human beings! But I find Kris to be a great musician (separating him from the boy band crowd), and I think there is a valid place for him out there.