>>536204926
Concentration adds to each parameter card.
Good condition multiplies them. Including that added concentration bit.
So yeah, you wanna mix some of both.

Good condition really shines once you unlock more Great Condition cards, so you can have it up the full round and then stack lots of Good condition, which turns into a stacking buff if Great is active.
The meta for Hiro's Step3 seemed to be run her Sense card and pick up a bunch of idol cards that give you reoccurring "get mire Good Condition" effects.