If by the rest of the world, you mean outside of North America and China, perhaps you are correct. In my own comparative tests in Michigan, Apple's Maps also best Google in giving directions. My girlfriend and I did the same test using Google's iOS Map App and Apple's Maps. On a series of four mile or less across town trips, Apple's Map App accurately gave me turn by turn directions and the App was easy to use. Google failed to auto correct and failed to tell me to turn twice. The App was also not intuitive to use. For instance, getting it to actually give me turn by turn directions took some fiddling around. Google's Maps actually suck in main land China largely because of the Chinese's government dislike of Google, whereas Apple teamed up with a local Chinese company to obtain the data.
Apple having accurate driving directions in North America is no surprise either considering Apple is using reliable street directions from Tom Tom. Where Apple falls short is in some other Countries and in Point of Interest information.