I think Chouji is more likely to die than Neji.

I believe that red pill was considered so bad not only because it would totally drain him, but there were serious side effects mentioned by Shikamaru as well. Most likely the pill itself poisoned him once his chakra was so low as to render him unable to combat the side effects.

Neji has not only the fight with Lee, but a whole life to live free ahead of him. Remember, the final flashback after his conversation with Hiashi in the medical wing was "Neji, live." And Neji remarking that he wanted to be free like the birds flying overhead. He represents hope for the future, I'd weep if he died.