I don't see Anthony Davis having a great career in the NBA. His athleticism and length is off the charts, but the guy just isn't that strong, nor does he have much of an offensive game to speak of at this time. He'll be a great college player. He might even lead Kentucky to the national championship this year. But I don't see many wirery power forwards making a living in the NBA right now. You can be as long as the Nile, but if you don't have the strength you'll get bullied around by NBA forwards.
If the kid had a great one on one game I might think differently. In the games I've watched though, most of his points come on put backs and alley oops, much like Drummond. I have yet to see him take his defender off the dribble or knock down a contested jump shot.
I could be completely wrong, of course. If he harnesses his offensive game and adds some muscle he could be very similar to Kevin Garnett. KG though, had more muscular definition than Davis does. While both are similar offensively at the same age, KG's strength allowed him to get his shot against strong NBA forwards and centers. I see Anthony Davis following in the footsteps of Anthony Randolph. That said, if he's still on the board at 2 or 3 you take him in a hearbeat. You can't pass on the chance to select a Kevin Garnett type player that can turn around a franchise.
As far as Lamb is concerned, I am more and more impressed every time I watch him play. The more I watch, the more I see a poor man's Kevin Durant. Obviously they don't play the same positions, as Durant is a 3 who can play the 4 while Lamb is your prototypical two guard. Athleticly Lamb and Durant are very similar. They both have a quiet explosion, they'll lull you to sleep and then throw down a monster dunk (see Durant's dunk on Haywood last year, or Lamb's dunk against Wagner). They don't have top end speed or great quickness like LeBron or Kobe, but when they get the ball in their spot, they are very difficult to stop.
Defensively, Durant struggled his first couple years in the league, mostly due to his slender frame (what did he bench at the combine again?). Lamb has added some muscle over the last year, but I do expect him to struggle guarding when he first gets to the NBA. Over time, his instincts and length will allow him to become at least an adequate NBA defender though.
To wrap it up, Lamb's game is glaringly similar to Durant's. They aren't jump out of the gym athletes like LeBron James or Dwight Howard, but they have that quiet explosion when they need it. They can both score in a variety of ways. Both are excellent in hitting the transition three, both are incredibly smooth coming off screens and hitting pull up jumpers, and both can shoot over smaller defenders.
The one advantage Durant has over Lamb is his height. As a 6'11 small forward, Durant can shoot over his man pretty much whenever he wants. At 6'5, Lamb has good height for an NBA two guard, but most of the guys he will be going up against will be just as tall as he is, meaning he'll need more separation than did Durant. Still, the calmness and smoothness in Lamb's game makes him too difficult to pass up on. At the very least, I see him as a reliable second or third option on a contender. He'll be a guy defenses will need to pay a lot of attention to, because if you give him a crack he'll find a way to get his shot off.
With all that said, the three best prospects in no particular order, are Drummond, Lamb, and Jones (Baylor). Just my opinon of course. There are about 15 guys this year that I believe would have been taken in the top five last year.