Well in a cosmographic map I prefer 3D mapping not just texture, similar to what I'd expect in a topographic or bathymetric map. More closely resembles maps you'd find use by an oceanographer which can be viewed at multi angles in 3d. As for best, don't really care I'd like one better than cosmographer as graphically its images remind me of an old apple 2 e. I've found a couple but they require you to really understand physics to even begin to utilize their programs.
My addition to the mapping software: It's full of Stars
This system generator has a steep learning curve and very ancient graphics but it is probably the most in depth one I have used.
Sorry if you wanted to keep this strictly planetary.

