This is a topic of a lot of debate that could be answered by a simple update from the Vishnu folks, but they seem to hate doing that and everybody is confused.
Although it says that "you should never use map 2" ( why is it there in the first place right? ) I have spoken to Shiv and he said, at least for the aggressive maps that came out earlier this year ( 4-23? ) that map 1 and 2 were exactly the same maps. I checked the settings on both maps and indeed they were identical. I changed the a couple of settings and turned map 1 to a "low boost" map which I don't really use and have not had any problems running map 2 all the time.
The 9-10 maps are a minor update, so I believe this is unchanged.