with only the towns of Famy and Sta. Maria needing updates on their town centers, I think it's really Laguna with most detail for all provinces...unless of course i wasn't able to scrutinize the others.

I say Best mapped but not really complete...lots of work to do to improve present data as well as POIs, POIs and POIs. I'm trying to recruit other locals to join the fun to update and edit

kudos to all OSM PH mappers and thanks to Bing for the hi-res imagery. hope you include Famy, Sta. Maria and Siniloan towns in the next satellite image update :P