Justin O’Beirne updated his Apple Maps/Google Maps comparison from last year. This is the most thorough comparison of the two products I’ve seen. One clever trick he did this year was run monthly screenshots giving you a sort-of time lapse.
Reading the article, Google seams better. I’ve been primarily using Apple Maps because of Siri integration but I'm going to run Google Maps for the next month to see if it makes any difference for me.