I'm testing both Android and Windows Phone on Sprint.  Both devices have free TeleNav service on Sprint, so the service using that application is roughly similar.  Both phones also come with stock turn by turn directions.  Android is a no holds barred knockout win.

The turn by turn directions in pre Mango Windows Phone is a joke.  You must tap the screen to move along, making it totally unusable for navigation when you are driving the car.  The Mango update provides considerably increased driving instructions.  If you follow the route given, the system works very well.  If you do not, you will soon want to through your phone out your car window.

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