For those of you who are familiar with both units, would you say that the Z2 navigation is superior to the D3? If so, besides the fact that you can use voice command with the Z2, why?

 

I assumed probably incorrectly that they would both be very similar. However, as I've begun to read more about the D3 I'm starting to think that it might be worth the money to go with a Z2 (if in fact the navigation is much better). This is a unit that will be in my dash for the life of my car, provided that it doesn't die, so I'm willing to spend an extra few hundred bucks if need be.

 

I'm trying to determine which unit to buy. Are there any other features that you believe are much better with the Z2? I like the internal HD for one (so no need to swap out discs) as well as the larger screen. What else is better with the Z2?