I've yet to find a use for perfect pitch other than it's a cool parlor trick. I'm not a 100% perfect as I don't really practice the skill, and I have a hard time separating my relative pitch from absolute pitch. Although from time to time when the band looks at you and asks what key was that in it's fun to have an answer.
Instead, I think interval identification is the most useful skill. Hearing two notes after each other and being able to name the interval is relevant to every genre of music and live performance, so it can be played back on whatever instrument is in front of you.
The next most useful skill (in my opinion) is chord decomposition: hearing a chord and being able to identify the component notes, relative to the tonic. Diads are useful enough for guitar players/bassists, but triads are super useful for piano players, vocalists, or other polyphonic instruments.
Instead, I think interval identification is the most useful skill. Hearing two notes after each other and being able to name the interval is relevant to every genre of music and live performance, so it can be played back on whatever instrument is in front of you.
The next most useful skill (in my opinion) is chord decomposition: hearing a chord and being able to identify the component notes, relative to the tonic. Diads are useful enough for guitar players/bassists, but triads are super useful for piano players, vocalists, or other polyphonic instruments.