I can't see how Google Map can be more accurate when Apple Map already gave me the shortest route, plus a few alternatives if I don't like the first choice. There is no way Google Map can give me better route than that so no it's not more accurate. It's just about preference, not accuracy. Google Map has more POI true. But more accuracy, nah.
But here where I live Google has way less accurate POI data than Foursquare which I use together with Apple Map since they can be linked and I get the best of both world, better POI than Google and more enjoyable turn by turn experience than Google Map as well.