When you get a chrono quartz movement, the second hand is in one of the sub dials (can't remember which one).
On an A21j movement, the second hand will be the big chrono hand, and the sub dials are frozen/not functioning.
If you have to get gen like functions, you will have to get a 7750 movement, but that is another price range than a quartz.
IMHO i would rather have a quartz chrono than a A21j chrono, but that is a matter of taste
:cheers: