Little surprised Schabbs has the most votes so far. His level was rock solid and I can't really knock it for anything but I don't think it was the true standout of all of them.
DHW (which is currently down) really should do another of these community mapsets IMO. But not for just plain Wolf3D or SoD perhaps. Pick a mod that has some other features and the authors' permission to do so. I'd love to see DHW Spear Resurrection SDL, for instance. Just need AReyeP's permission, as I'm sure talented authors are more than up to the task of putting all the new features to good use. Totengraeber also came to mind but I'm not as sure; to really be worth trying a community pack on a mod over just the original I really think there just needs to be at least a little more in changed/new features to use, compared to Totengraeber. Plus it needs to come with an editing kit. And finally it has to be something that can be developed as SDL. SR fits the bill perfectly and in fact I can't think of anything else that does!
Anyways that is OT in this particular case but if AReyeP signed off on permission I see potentially enormous potential to give that a spin for another DHW SDL community set of maps, and one that's clearly different compared to any others done so far. It would be my token choice of what to go with.