I've compared all the versions -- for several years now.The Special Edition on VHS video was the first I ever bought. Then I bought the DVD release. Neither of them could compare to the movies that once aired on the Scifi channel a few times a year, and I didn't know why.
Now, I think I do.
I had to buy the unaltered DVD's when they came out. There was nothing wrong with the Special Edition's wider shots, or the changes to the Yavin sky. there was nothing wrong with the Special Edition's heightened graphics, or any of that type of thing...but something robbed those movies of a small portion of their souls.
A classic example of this (and I've noted this before) was after Luke finally escapes Vader. It was after their fateful duel in the bowels of Cloud City. In the Special Edition, when the movie cuts back to Vader, he is cool, calm, collected, and he glides through the halls, commanding stormtroopers to, "prepare the Executor for his arrival."
In the original version, of the same scene, Vader is striding through the hallways of Cloud City, with a contingent of troopers hot on his heels. The camera almost shakes with his metal fury, and he demands that they "bring his shuttle," [to him].
That's it. His anger carried me seamlessly to the next scene. I was still captured by the character enough to suspend my reality, that I was really watching a movie.
That was the Vader I'd always known. Furious, and ready to lash out at a moments notice. That was the Vader that Admiral Piet feared would kill him once the Rebels escaped a few scenes later. That Darth Vader had soul, even if it was cyborg soul.