he is in the other branch of the hyuuga hinata is the main branch of the hyuuga
You know what I never really got about the whole Hyuuga system. Hizashi (neji's father) was the twin to Hisashi and yet he had the branch clans mark on his head, meaning they didn't consider him part of the main household even though they both are the sons for the Hyuuga elder, yet both Hanabi and Hinata are considered part of the main house and they're siblings as well. I know Hinata was disowned (Idk how that works I mean she's still living with her father) by Hiashi because of her inferior skills to Hanabi (and also because he's a ****), so why hasn't Hinata been branded with the seal or Hanabi since she's younger. I never understood that, also why is neji the only person in that family that has a name that doesn't start with an H (Hizashi, Hiashi, Hanabi, Hinata , Neji???) it's not really a big deal just saying...
On topic I believe Neji is still a superior fighter but no doubt that Hinata is close in her taijutsu to his, enough to cover him on the battle feild and preform tag team jutsu with.