This weekend I was able to try out both apps. On the way there I used Google. I liked the map, I also didn't like the voice but with the screen size of the EVO you can quickly see what is going on. The big problem Google wasn't even close to the right place. It brought me to a residential area with 100 addresses and I was going to a large resort in the commercial area with a 200 address.
On the way home I used Sprint, I didn't like how it called out the street names. In some cases when you have a local name that is also known as a US route no. I prefer the no. and not the local name. (Just how I roll I guess) That makes it a little more confusing for me. I also just didn't like the look of the map on Sprint. But it did know the location and did a better job getting me home. IMHO nether one is the bomb and I would like to combine the two onto one nice GPS app.