Apple Maps is much better in my experience. I've never had an update rejected.
I've sent in corrections to Apple Maps in Portugal (shopping mall is 1km away from the location on Apple Maps) and Canada (speed camera does not exist). Both were taken care of within a couple of days.
It took them two years to update my address.
but then again Apple Maps seems (certainly here in London) to be absolutely full of geofraud entries and out of date slop, such as small businesses with linked websites that have been shuttered for years, and strange businesses located in the middle of playing fields, parks and lakes.
At least in my personal experience, Apple Maps is much worse at up to date business information than Google is
But when I've submitted updates to road changes a couple of times, they did go through
They are absolutely awful and won't accept even a correction of opening hours - when you are the owner of the business and registered as such with Apple.
I just changed the hours on a business nearby, took ~3 days. Your experience is not universal, but definitely frustrating.