There does indeed seem to be two camps when it comes to the living dead - the "28 Days Later" vibe which seems much more guttural/aggressive, and the B-movie-styled growly/laughable (which is usually the point, I think).
I've been watching AMC's "The Living Dead" and I found myself a little surprised that the sound choices have been more on the B-movie side - the pickaxe through the head sounds they use are over the top, the zombie bites and organ tears. It seems the intention of the sounds are not really to make you squirm, but to pay homage to those older zombie flicks.
Additionally, those sounds seem to generally sit "on top" of the mix as opposed to being part of the scene. Interesting choices. I'm not sure that I would choose to treat the show the same way, but I love hearing soundtracks that push those kinds of boundaries.