I've seen neither ending yet, but I'm sitting here trying to imagine any ending at all other than the one from the book. I can't do it.

Neville talks to Jesus and dies in the basement, blowing his house to Kingdom Come after shoving the woman and the kid into a niche that would hardly have protected them from the blast or the subsequent inferno. Woman and kid take a vile of his serum and drive away to picturesque rural Vermont where the U.S. military is guarding a town filled with the uninfected, walled off from the rest of the world. Dumb, dumb, and offensive, to boot.