I have a bias. I grew up a Vandy fan. Then Dinardo came in, killed the star logo and put that horrid V with "Vanderbilt" running across it. When Bobby Johnson came back, they brought back the star logo helmets from the 80s but made them gold (which looks a lot better). It's the one football thing they've gotten right. From top-to-bottom they have just a great uniform.
Other than Vandy and Tennessee, I think Auburn looks pretty tight.
Actually, with the SEC, there really isn't a wrong choice. Although Kentucky's white helmets look pretty dated. I don't think they wear them that often anymore, if ever.