Guess it depends on where you live/what you are looking at.

Having just gone through a recent home buying exercise in mid-west I always reverted to bing maps for a "birds eye view" as they had 4 directions of shots from their plane camera while google just had satellite then went into some kind of rendered/extruded view which was kinda eh.

Now if I compare that to our office in SF then google better than bing for zooming in.