The surgeon gave you sufficient visual comparison proposals with the expectation that you could decide which one looked better to YOU. The displacement measures/numbers are incorporated within the VISUAL proposals. OK. The surgeon is expecting you to observe such things as the lower lip is less behind the upper lip because it's advanced further in the double jaw surgery. Even if you're not in the capacity to pin point the subtle differences in the DJS, your still expected to tell which one looks better to YOU. So, with that, he's assuming you are in the capacity to evaluate whether it's 'worth it' to YOU to go through what ever extra pain and expense for the change to be observed, especially in the profile comparison, to have the DJS. That said, if you can't determine which one looks better to YOU, then get the one that is the least surgery.