Is this (partially) correct:
Alpha and Beta follow their enthusiasm.
Gamma and Delta follow formality.
Is this (partially) correct:
Alpha and Beta follow their enthusiasm.
Gamma and Delta follow formality.
It is for me.
I would say that I am enthusiastic by nature but hide behind formality when I am uncertain or uncomfortable.
How about:
Alpha and Beta follow their enthusiasm when they feel comfortable
Gamma and Delta follow formality when they feel comfortable.