I always take Bama out of this argument due to my bias.
If we are talking just about campus and stadiums:
1. LSU
2. Auburn
3. Ole Miss
4. Mizzou
But if we are talking about overall experience (fans, better/worse expectations, etc)
1. LSU- can't believe how cool LSU fans are down there. Every true college football fan should go there for a night game atleast once
2. Mizzou- Columbia is a nice town, and the fans are generally the older classy type. The stadium could really use an upgrade. It's more or less kinda what most say what Vandy is
3. Auburn- I kinda feel that the stadium really looks odd with that huge scoreboard on one side and the legion field like scoreboard on the other. I went in '15 and the fans were still all up in my face despite them having a bad year. And trying to get out of there after the game is a real pain.
4. Ole Miss- out of all of them this is probably the one I'll never do again. The stadium has a nice field, but that's where the positives end for me. The grove is kinda overrated to me. I honestly think the quad is way better. I also had a real bad experience with their fans.