Re: is the difference in 2gb map and full map only the POI's?
Some older maps (6xx/7xx) had less detail based on size. For recent maps the difference is the size of the POI dat file according to TT.
If I had to choose between an older full-sized map and a newer 2GB map, I'd go with the newer map. To me POI quality is more important than quantity. If you've ever driven to a POI that's no longer there you know what I mean.