I agree with @DavidP
At the moment I’m working on Guitar Challenges (Songs) - Is There Anybody Out There? (Pink Floyd) and the 321 fingering for the Am chord is much simpler and more logical than the “official” 231 version. Also, when I play A, Am and Asus2 and Asus4, I use the 234 fingering for the A chord, leaving finger 1 in place for the Am. That way I only have to move my pinky from one fret to the other, or lift my index finger and pinky. It’s much easier than having to switch from the “official” Am to the “official” A fingering.
In the end, the context will decide what is the most convenient way to play a given chord.