neji doesnt stand a chance against gaara and you know it. gaara has the sand demon doing all the work for him. if gaara doesnt have the sand demon and relies only in his natural abilities then that's the time i can say neji will kick his ass.

and as for tenten being biased to neji, we cant blame her since she doesnt know about gaara's sand demon. she just thought that maybe gaara also used his chakra to create that sand shield much like neji does with his heavenly spin. if she knew about shuukaku, then im pretty sure she'd change her opinion on neji's and gaara's so called absolute defenses.