Well, Clowney is obviously awesome. No one was suggesting Manziel was better, but it is easier to trade for pick 10 than pick 1. Manziel may be available at pick 10.
Also, I've gotten a look at Derek Carr. He's interesting. He flashes talent everywhere, but sometimes hyper-focuses on certain areas of his game, causing others to falter. If he's not throwing well, the next drive he will focus on nothing but perfect mechanics, at the expense of his reads, e.g., a quick slant against cover 2. That might work if another receiver is anywhere near the flat zone, but, given that the flat defender wasn't at all conflicted with regards as to who he should cover, it was an easy play, nearly a pick six. On the other hand, he's one of the only quarterbacks I've ever seen make a coverage read (as opposed to a progression read) at the collegiate level, and he made a perfect read, a receiver running the fly with no help over the top. However, being so focused on his reads, his mechanics were awful (it looked like a fadeaway) and I can't imagine the throw being much more inaccurate. Still, he flashes greatness in every aspect of quarterbacking (except making a pass rusher miss a tackle, plus iffy foot quickness), which makes him intriguing. I'd say he's a poor man's Joe Flacco right now, with the potential to be much better than Flacco down the road.