Of course good defenses win more Super Bowls than good offenses.

Think of it this way, I have an overly simplified football team.

You can sign the best quarterback or the best linebacker. Somehow you are sure each one will help win the exact same amount. Which should you sign?

In a completely free market, it wouldn't make any difference. In the NFL, you should sign the linebacker.

Why?

If you have a better quarterback then you will have more passing yards. Your receivers will look better than they actually are. Better looking wide receivers get paid more. The defense will protect more against the pass meaning your running game will do better. The running backs will get paid more. Overall, the offense will get paid more.

If you sign the better linebacker then other defensive players will look better. Now, honestly, do you really know that the left tackle or the nickel back is better on the Jets than the Giants??? Yes, the other players on defense will look better and need to be paid more. But the extra pay will be far less than you would have to pay the offense if you signed the great quarterback.

I would love to be the GM of an NFL team. I would get the best defense and the best offensive line and get OK players for QB, RB, TE, and WR. No one would pick my players for a fantasy football team but we would win most of our games because of our great defense and our great offensive line.