I'm looking to develop a webpage with a map API. I'm not sure whether I should go with Google Maps or with Bing Maps. I looked into loading the map information from a KML file, but it seems as though there are many restrictions placed around this method. I'm going to use an online databse, like MySQL, to store the map information, which I understand would allow for better manipulation of the data compared to KML files. I'd like to load three map layers onto the map application, and enable the user to view any combination of the three, if that's possible.

I'm open to using either Google or Bing Maps. How does Google compare to Bing in terms of how they manage data from an online database? or is there some other factor that I should consider?

Thank you in advance :)