Respectfully, you are basing this on what, your own experience? Apple maps has shown some very real probalems around the globe, none of which are as severe on Google Maps. How do I know? Well, millions of people use Google Maps (Navigation on Android) and I am not reading about any such complaints.
My anecdotal evidence in Boston, MA: Apple maps has routed me to the wrong place five times and dialed a residential number where it was supposed to dial a business. This has never happened on my Android devices (although my Lumia 920 is just as bad, in different ways).
Respectfully, Every issue that has been complained about with Apple maps I have personally experienced with Google Maps. I no longer use the navigation because I've been sent down too many dirt roads / private roads to trust it again.
Google Maps has been around a very long time in tech terms so they have had a lot of time to get things right and if it ever doesn't, hey it's in beta (don't think it is anymore but Google have a history of keeping public products in beta for a very long time).
The hate on Apple Maps is 90% tall poppy syndrome. People who don't like Apple (or know Apple) have a holier than thou view of Apple (somewhat justified I agree) and love to see them fail.