A purely defensive team like the Sharks a few years ago, were painful to watch as they ground out wins, but they won.Or this all happens because the team you are playing is poor with the ball.
You could argue either way for ever, if you are great at attack the other team never gets the ball vs Defense never lets them keep it. We would need some advanced analytics beyond points for and against here.
I would argue the Warriors have been attack focused for the majority of our 25 years and while it’s been fun we have not reached our potential.
More important is probably the fundamentals that underpin both - fitness; desire; competitiveness; footy brains; leadership in key positions, etc so you can have a strong attack and defence at the same time.