Generalizing one service's maps as good or not good is a complete waste of time in my opinion. The differences within one Country are massive let alone between Countries. This is a neighborhood by neighborhood question and all of us have only an infinitesimal fraction of experience with the entire breadth of the maps offered by these companies.
Thank you for the update Shirli. If you have two customers, one that heavily edits in Google's editor and one that heavily edits in the Waze editor, will each of their efforts help the entire community going forward? In other words, if I add a road in Google that also isn't in Waze, does my effort help the Waze community and vice versa? If it does not, I think it would be a squandered opportunity that could come from this acquisition. The collective community together can create a much more accurate map than the divided community can when kept separate.