Originally posted by vonBaloney I think it just depends on the combo
It really does, some lenses work better on extension tubes than others, just like some lenses work better with certain diopters than others. Without trying every possible combination, it is impossible to know what will work best with what. Just find a setup that works for you, experiment with reverse mounting lenses and enlarger lenses too, there are many ways to achieve macro focus.
That site showing the test is terribly flawed, mostly because he didn't even use the same lens. I understand that he didn't have extension tubes to use with the Minolta AF lens, but he couldn't even be bothered to put the diopter on the Rokkor. He just proved the Minolta AF with a diopter is better than a Rokkor with an extension tube, which is useless. To definitively prove anything, you need a variety of lenses each tested with the extension tube and diopter, even then you might not prove anything.