I don't know what is available in the way of free trials of those actual programs, but as a suggestion, you might try the free software 'Autorealm' which is a similar concept to CC3 (though probably less capable) and the free software 'Dungeonforge' which is a similar concept to Dundjinni (though, again, probably less capable).
At least this way you can try out their very different styles without spending any money.

Alternatively, you might want to look at Viewingdale or Maptools, which offer a third concept in mapping, or Photoshop and Gimp which offer essentially 'hand drawing on the computer' as your fourth option.