This is related to Engine Prime, but I couldn’t get my answer on as the thread is closed. This is regarding the key Analysis. Sorry if a mod thinks it is more relevant somewhere else, please move.
OK - I’ve done some research on this and MiK is the gold standard. Its is about 85% accurate from the reports that I’ve read, and Prime gets about 85% of those right (I analysed 100 tracks, from mixed genres and ages). Prime is much better with newer tracks than old tracks.
So all in all, statistically, Prime is 72% accurate in its key analysis.