I enjoy both.  I've tweaked all of the problems out of them (at least the ones that matter to me), but I agree that the 767 is marginally better because of the night lighting in the cockpit off the shelf.  I have a 757 gouge that takes you step by step through every switch... the skeleton of a tutorial.  I haven't given up on one and have have taken a lot of the screenshots, but I've been very lazy.  I have both and would give up every other addon before I would give up either.