Adam,
Allman Brothers not "gritty" enough?
SheClown -
Interesting question. I missed this post, sorry.
I think it's not so much "gritty" as the fact that I always thought stylistically they were more like a hippie band - much like a lot of their British contemporaries. They favored long, rambling blues-based jams. Indeed, "Mountain Jam" is based on a song by Donovan. So they seemed to be a Southern version of Blind Faith or Cream or something.
Lynryrd Skynyrd, on the other hand, didn't really strike me as being hippies - even though they were only a few years later (and they certainly overlapped). They are definitely 70s hard rockers. Their music is much more direct and, although there was a bit of jamming (live) on the guitar solos, they were pretty straight-forward. They may have taken some stylistic cues from the Allmans and may share some common influences, but they are two very different bands that produced very different music.
In many ways, Lynyrd Skynyrd are like a redneck Thin Lizzy (probably a facile description based on the twin lead guitars, but I think the story telling and hard rock aspects - as well as the incorporation of blues strengthens the comparison a bit).