It sounds like it’s going to become a reality in a few hours: Google Maps for iOS 6.
My experience so far with Apple maps hasn’t been terrible. Data quality issues never actually affected me. I have missed the lack of public transit. That is the primary reason I plan to switch over. Public transit integration is critical in NYC.
I’m hoping it’s just a refreshed UI of what was in iOS 5 with as lean of a UI or leaner.