Defense doesn't matter if you can't score. Offense doesn't matter if you can't defend.
?? The light is only on when it's not off.
Defense first because it can win for you even if your offense is uneven or not so good at all. Also, it seems more a product of thinking, effort and coaching than pure skill. Seems to me that a team can
will it's way to solid defense more readily than it can will it's way to solid offense.
When I played, setback to the game that it was, I was rather horrid on offense but could stay on stay on the court due to thinking effort on defense and rebounding.
Plus, it was my ball. If I didn't get choosed I'd take it and go home.