Old thread, I know - but the sort of discussion that happens regularly.
I have the Hema Great Desert Tracks and the Vic High Country maps. They're similar to Rooftop's, but Rooftop's cover a much smaller area with every track listed and named. Hema are a little better to larger areas, but will still get you by.
Comparing Bright-Mansifeld Adventure Map and the Hema High Country, I prefer... both