well if we look at just this specific image, if you look at Swinton St and Frederick St the Apple version has the A501 wrong.
But more fundamentally Google Maps is much easier to read at a glance, it's colour coded so you know which streets are main streets and just how 'main' they are and where they go, it shows much more information including street names and which roads are One Way, it even shows back and side streets (around Calshot St)
I strongly suspect that this basic road only view that the Apple Maps is using now will not change one bit for the public release, and it will be disappointing if it doesn't.
But hey we will just have to wait and see, I won't be running iOS 6 until it's actually released anyway and even then if Google has it's own maps app then at least I'll have choice, and choice is the most important thing.