I think you ought to go by the "without brakes" weight. In the article they used smaller drum brakes on the S60 and 12 bolt, with the 9" getting much bigger and heavier brakes, even so the weights are close either way.

I'm thinking, subject to packaging constraints, that the S60 wins based on cost. The other numbers are close enough, in either direction, for them to be a wash for all intents and purposes.