[GeeTwo]

Having spent two evenings looking for a drive configuration that can cross all of the "drive over" class B and D defenses (while also fitting under the low bar), I think there will be teams that have trouble with each of them. I expect the same of the moving class A and C defenses. I doubt that there's any one that will be so generally easier than its counterpart that any of the obstacles will be "unused".

Edit: especially not the moat, which is currently in the lead. That was the hardest one not to have some failure mode, whether high centered over one edge, nose-in, or high-supported by both ends.

Edit2: I managed (in drawings) to get a robot with 5" of ground clearance stuck in the moat, or at least prevented from continuing to move forward. That spacing between two tall thin walls stymies many of the patterns I tried that could traverse the other non-articulated defenses. Most of the designs that had no trouble with the moat got caught on at least one of the rock wall or ramparts or rough terrain.