Advantages of Roll20 over RPTools

If we compare it to MapTool, this is the first couple of things off the top of my head. Roll20 Pros: Three different methods of Integrated Video & Voice chat Browser-Based so the software is cross-platform on Mac, PC and Linux without needing a virtual OS Cloud-Based Image Library: The players don't download a giant campaign document folder and all its art assets to view the map/tokens/etc. Everything is stored on the GM's Roll20 allotted cloud storage. Very K.I.S.S. UI design (at least we try to keep it that way) For the most part, it is very simple to connect to games Roll20 Cons: Limited programmability Vector based rather than Raster based: You can't paint with textures like you can in MapTool. It's also recommended that you don't try to create a map from scratch by going tile happy in Roll20 itself, simply because this can reaaalllly slow down your campaign. When you paint in MapTool you're essentially creating a map much in the way you would an art program. In Roll20, you're always going to have art assets floating atop one another. They'll never converge into a single large image. No print to image method to export a final img of your map to use as a printable version

I know there's a couple of Roll20 users who still use MapTool for building their maps (which they then load into Roll20 for gaming purposes), they'll probably have a better grasp of the differences and will hopefully pipe up. It's been years since I've touched MapTool.