Part of me feels that Watchmen and The Dark Knight Returns should be on here as well, maybe in place of Fables and Punisher.
Anyway, because I still haven't finished Sandman, I can't comment on that. But I have read every issue of both Preacher and Transmet, and, to say the least, they're pieces of literature -- as I know Sandman is.
However, what Garth is doing with the Punisher right now is a breath of fresh air, especially after the campy garbage he was producing near the end of the last run. With that said, I don't know how long he can sustain it until it becomes old -- again. Cursing and excessive violence can only carry you so far. Then again, that's pretty much what he's built his career on. (Don't get me wrong; I love most of what the man does. I'm just saying.)
So, after careful thought, my vote goes to Preacher because, despite the circumstances, it felt real for the most part and it was something I could relate to.