I probably like the DVD versions the best. I love the improved visuals and cleaned up footage. I also like that if Greedo isn't made to shoot first again, at least he and Han are more or less shooting each other at the same time. I also like McDiarmid being added to ESB. Overall, I'd say that the improvements overshadow the bad parts (poor lightsabers and Hayden at the end).
But I'm also glad I still have my copies of the originals.