Nina's is different. Campbell's was trying to prove what you should eat; Teicholz' followed the history of the science to see where it went. The difference is subtle, but significant. Based on what I've seen and read of Campbell, I think he would expect his work to be the last word on nutrition; I think Teicholz would see hers as a beginning.

I recognize my own bias here, though. I think there are serious flaws in the China Study where Campbell reached beyond where the science illuminated. Teicholz isn't trying to prove a conjecture in the same way, so she isn't forced to do that (I think Robert Ludtig and David Perlmutter both did the same thing, so it's not just a function of vegetarian or not).

Edit: I say read them both and decide for yourself. Don't accept either of their conclusions, but follow the science they reference and evaluate it for yourself.