I've seen quite a bit of both of them. Trent can make the throws that Tebow doesn't even bother attempting (btw I don't think Trent is good, but his problems are about 95% mental). I also think he can take hits, but in the NFL the hits are a lot more brutal because the players on defense are bigger, stronger, faster, and are all men rather than borderline teenagers.
I really like Tebow as a competitor and understand those that think this will translate to the NFL - imo its gonna be a huge leap. His best chance is working nonstop on quickening his release. At least then I think he might have a chance.