In my experience it also has more accurate lane guidance and, as you say, better delivery of audible driving directions ("go through these lights then, at the roundabout, take the first exit"). Google Maps also has an annoying habit of choosing the quickest route at all costs which, in certain parts of the country, involves going miles down single-track country lanes (which legally have a speed limit of 60 but more than 30 would put you through a hedge or into an oncoming tractor) when a dual carriageway A-road would be only 2-3 minutes slower. I can't say Apple Maps doesn't do this, but anecdotally it seems to do it less.
However the business info is still way behind Google, particularly regarding things like temporary closures.