I agree with everything said so far, and thanks for the compliment on the substance of this poll, 64.
All these rivalries are very good, some intense, and some just downright hatred.
Most historical or storied traditional rivalry would've been Bama-Auburn, hands down. But fiercest? I had to go homer on y'all and go with Ole Miss-MSU. Yes, the OM-LSU rivalry is downright chocked full of loathing.
But the MSU-OM rivalry, to me, is extremely ugly. I'm basing this on years of visual proof I've had at games. :D Remember '97, I think it was, where they had to delay the Egg Bowl by about 20 minutes, due to both teams getting in a all-out brawl before kickoff? That's what prompted my vote, and that wasn't the first brawl trust me, not to mention a little bias in my pick, too, probably.
But, there are some others listed here that would certainly qualify. Just depends on who you are, I guess.
Keep those votes and opinions coming, though.