I really like Lee but i dont think this is even debatable.

Neji's eyes are superior to the Sharingan, he obviously can see the speed with it because it shows him using it to watch Lee the entire time. Not mention he can see 360 degrees and Lee's little trick he used on Gaara of rotating around him at high speed will not work at all on Neji. Then Neji's absolute defense is even greater than Gaara's.

In the end either Lee would get his but kicked by Neji's own skill (unlike Gaara who could barely harm Lee at all) or Lee would self destruct trying to break Neji's defense.

Neji is not only superior to most jounin, but he is superior even to jounin of the Hyuuga clan which is the best.(other bunke members are certainly jounin, and his abilities have surpassed them. Hinata's father says so himself). This is why 4 jounin went to stop Neji agaisnt Hinata. Just cause Naruto can probably win by using the Kyuubi does not mean Lee can. Lee only has one abiltiy unlike Naruto and it wont work.


*EDIT: dont mistake that I dont love Lee here, but no one is pushing for Neji so I figured I'd make a long post. Also everything I said is based on the anime I dont read the manga so might be proven wrong one day but so far it is true.