I was working at jimmy johns as a driver about four months ago. One of the drivers there had a Nokia phone, I had an android, and obviously delivering you often get addresses that are sometimes slightly incorrect etc. Google maps never failed me, the windows phone guy would get lost constantly. I don't know why, could be just bad driving, but one thing that the google maps seemed to be better at was determining the location of businesses and for traffic and TRAINS (since the town I was in had 2 different tracks).

In short, I'd have to agree that google maps is unparalleled (important to note that the iPhone people didn't even bother using their maps).