You may want to take a look around FUM.com. They specialize in the VTT aspects, but have a bunch of stuff in that realm including comparison tables and whatnot. I think they have a comprehensive list of all the VTTs that are out there as well.
Raster (bought) [e.g. Photoshop, PaintShopPro, Painter]
Raster (free) [e.g. GIMP]
Vector (bought) [e.g. Illustrator, Corel Draw, Xara]
Vector (free) [e.g. Inkscape]
Vector (Symbol driven) [e.g. CC, Dunjinni]
Online Generator [e.g. City Map Generator, Fractal World Generator]
Fractal Generator [e.g. Fractal Terrains]
3d modelling [e.g. Bryce, Vue Infinite, Blender]
Scanned hand drawn maps
Drawing Tablet and pen [e.g. Wacom]
You may want to take a look around FUM.com. They specialize in the VTT aspects, but have a bunch of stuff in that realm including comparison tables and whatnot. I think they have a comprehensive list of all the VTTs that are out there as well.
I didn't find a comparison table on fum, only a link to an empty website and Heruca has a very comprehensive list of VTTs. But no sign of mapping abilities in those I've seen. Have to say, the new fum site is not the easiest one when you're trying to find something specific; or maybe it's just me.