I run Campaign Cartographer 3 on windows so I cannot comment on Crossover, but I can recommend CC3 with a few provisos.
It's ideal for making realistic looking maps quickly, You can get a half decent map down in maybe half an hour. However, if you're making a real world map I do find it lacking somewhat without a relatively pricey add-on. Even the add-on that adds the ability to work with some modern icons I find lacking in some respects.
It's ultimately more designed for the fantasy market, so if Mars 1888 is your thing I can see it working for you, or if you're looking to create a small area of land. Continents etc with the detailed information on states with the full border extravaganza it starts becoming a lot more tricky.
So recommended - mostly.