Trislander, MemoryMap is the easiest to use, but it does quite a bit less than the other options. Also, for some people the map display is overly detailed, being as it is a regular CAA map. As features can be turned on or off on vector based maps (like NavBox) you can customize the display. Airspace in particular is much clearer on these type of maps. As such I'd have to say that the choice is not completely clear cut for some people.