For my Classic Editions, I picked what I thought might be the best and most memorable parts of both of the main sound mixes for the films. Kind of to merge them into one "true" version that never actually existed before. Hence "Not the way it was, but the way you remember it."
That said, if Lucas released any version of the original original trilogy on DVD, we would probably accept the DVD quite quickly as definitive regardless of which mix he used.
Unless he did what he would probably do, and change the mix once again, as well as leaving in minor touch-ups and changes.
Hm.