This is the project I'm working on at the moment: a set of interlocking battlemaps (in d20 scale each of the examples is 24x30 inches)

They're not really mudcaves, but when I reduced the resolution to make thumbnails, they really went to pot, so until I fix the resolution, these are mudcaves.

So the real question is, what sort of maps will benefit you (if you're a GM) the most? What scale and resolution?