I think there is no doubt that AnkiMobile is more polished than AnkiDroid.
AnkiDroid was previously not updated for about 2 years, Ankimobile is updated regularly. E.g. AnkiDroid does not support custom scheduling(so users could not use the first FSRS with the app only).
As johncaiwa complained before, AnkiDroid can have small issues left for about a year, there is no such issue with Ankimobile as far as I know.
Such differences are by whether it is a volunteer or a business.
Volunteers are not paid because they are literally volunteers, so if they develop a lot they run out of resources, so they develop in their spare time and their vacations.
Business apps increase sales by selling, developing more will increase their resources and they can develop full time, so the business developers will always develop faster.