A few months ago, I would have said Greg Jacksons camp was hands down the best camp. Diego was undefeated and dominating every fight. Rashad is undefeated and dominating every fight. Jardine has put together a small winning streak and is coming off a huge ko win over a top contender in Forrest. GSP is the number 1 WW in the world, was the UFC WW champion, and was at least in the top 5 p4p in the world. However, with the recent losses from Diego and GSP, they have shown a little vulnerability. Those losses don't take to much away from there credibility, but they do show that these guys are not invincible.
With that said, i'd have to say that Team Quest and Greg Jacksons camp are pretty even at the top. No doubt, GSP and Diego are gonna have much better showings than their recent losses and are still top ranked in the world in the WW division. Rashad is still unbeaten and has a match coming up with Tito that will tell alot about both fighters. He's no doubt, a top contender for the LHW championship. Jardine, imo, has looked pretty impressive from his debut in the UFC and pretty much got screwed out of a win in his fight with Bonnar. Jacksons camp is young and full of talent and potential.
On the other hand Team Quest, most of the notable guys from there, aren't so young but are still full of talent and potential. Henderson and Couture have solidified themselves as legends in mma and are currently on top of their game with Henderson being the pride WW and MW champion, and Couture being the UFC HW champ. Lindland is ranked number 1 in the world in the MW division and has a lot of skills. Then they also got the young guys with a lot of potential, more so in Sokoudjou, but they also have Burkman, Leban, and Herman. Not to shabby if you ask me.
Jackson and Quest.