Well this digressed a little bit. Oh well, sometimes you just gotta go with the flow. In a vacuum, I strongly think Victory Celebration is the better song. In context, maybe Yub Nub closes the gap, but I remain unconvinced. And to be honest, I think people have strong loyalty to what they heard first. I grew up with Victory Celebration, and most people here heard Yub Nub first. Just imagine if Victory Celebration had been in the original, and in 1997 Yub Nub had been swapped in... I know I would have been ready to riot.
As for Lucas and the Han Shot First shirt thing, I honestly think at this point in time there is absolutely know way to know what he's thinking. I suspect I am a lot less venomous towards him than many, but he simply doesn't make sense. I think this quote in particular gets me: "I am very concerned that the films that I watched when I was young and the films that I watched throughout my life are preserved, so that my children can see them." I don't know how a rational person says that, on record, and then does what he does in terms of the Star Wars franchise. I don't think there is a rational explanation. If I had to guess at one, I would bet that he truly believes in that quote, but has convinced himself that *his* movies are different, and that they don't count. This rings especially true with the recent discussions on -1's blog, in terms of how hard it was and how much of a compromise it was to do some of the optical effects back in the 70s. If he has actually convinced himself that he would have done the movies that way back then, I think I can start to see the warped logic. This becomes even more dubious, though, with some of the nonsensical changes (Ewok eyes, Vader's no, Luke's scream added and then removed again, etc.) Hopefully that paragraph made sense - I tried to keep it from getting too long but may have sacrificed clarity.
Back to the song choices, I think a huge aspect is what they were used to convey. I think Victory Celebration has a far more epic (I hate to use a word that has been so clichéd lately, but I think that is the right word) and wide-ranging scope, which we see in the shots of the rest of the galaxy. Whereas in the original, as someone said, all we see are our beloved heroes dancing with teddy bears, and I can grudgingly see Yub Nub perhaps making more sense. This then raises the issue of adding the galaxy wide shots, which again, I have no huge qualms with. I personally believe that the death of the dictator of an oppressive regime would lead to widespread celebrating, but others may disagree.
As I've said before, I absolutely LOVE Victory Celebration, and I personally think it makes for an incredible ending to the trilogy. I watched the 97 ending again today, and even though it's the umpteenth time doing so, I still get chills and a emotional torrent of nostalgia for my childhood.