Google Maps for Mobile 3.2 came out today and it now has support for Layers.
Layers make it easy to view various types of information on your map and are especially helpful in situations when you’re traveling somewhere new. For example, you can turn on the Wikipedia layer to read entries about nearby places, then use the transit lines layer to help map out a route. Or you can use the My Maps feature of Google Maps to create a collection of places you’re planning to visit on your trip and then use Google Maps for mobile to access it from the road. You can also turn on the Google Latitude layer to see your friends’ locations.
There is probably something that BlackBerry Maps does that Google Maps doesn’t, however, I have no clue what it as and am pretty sure that I don’t miss it seeing how I am pretty sure that I don’t even have it installed on my device any longer.