The compositing in the SE is generally superior, and for most of those it wouldn't really be worth changing them back just to introduce low res shots with matte lines and so forth. I do think the placement in the original shots tends to be better, but it would be difficult to even notice the differences except in a straight comparison like this. I like the look of the Millennium Falcon's engine glow in the original better also, but I don't know how you would go about reinstating that without changing the rest of the shot.
Colour correction--mainly eliminating the general blue cast, and dialing down oversaturated reds on Tatooine--is the most important thing. But the '93 transfer doesn't exactly have stellar colour itself, either, so I'm not sure what it's really 'supposed' to look like. Given the kinds of differences apparent between the GOUT and the SW Technicolor print, the film's true look is most likely something in between the extremes of each rendition.
Has anyone ever arrived at a satisfactory answer for why the old copies of Jedi have blue stars? It's very bizarre looking.