There's no simple answer. Google Maps still has far more worldwide road and POI data and in general it is more accurate. They also have Street View, while Apple is just getting started on that. Most people feel Google Maps still has a better handle on traffic.
But I still use Apple Maps almost all of the time now. It's cleaner, runs smoother, is far better integrated with the phone, watch, and CarPlay. The quality of the maps and traffic info has improved drastically from the early days. For me, it is generally indistinguishable from Google Maps now, and better for most of my needs. But I live in Northern California, which is always the first place Apple updates.
Also, Apple's implementation of street view is substantially better than Google Maps from a quality standpoint, but right now it only covers three locations, so it's hardly more than a demo of what is to come. But I'm excited about where that is heading.