I think Skynyrd is ignored when it comes to Southern Rock.
It seems to always be about ABB. As far as I am concerned the classic line-up of Skynryd(read pre plane crash \'77) put out way better music than ABB w/ Duane (read up to \'72). Skynryd saw ABB and said to hell w/ it let\'s have 3 guitars. That third guitar adds so much to their "swamp music " that I feel it defines Southern Rock more that ABB. When it comes to jukeboxes around the country, I bet Skynryd is in more of them than ABB,yet everyone always raves about ABB.
There is also the thought that "Classic" Marshall Tucker Band kicks ABB butt also, so I would think it goes like this:
Top 3 Southern Rock Bands
1. Lynryd Skynyrd
2. Marshall Tucker Band
3. ABB