Before anyone gets too excited about the superiority of the laserdisc 5.1 track, I suggest they read this article about the supposed differences between it and the dvd version. http://www.videophile.info/Graphs/TPM/TPM_01.htm
According to this, the only significant difference in mixing between the two (aside from the parts where scenes were added or taken out) is that the dvd version is an average of 8 db quieter than the laserdisc, for some reason. If you adjust the volume up to compensate, any differences will be much less pronounced.
Having said that, however, as disappointing a movie as Phantom Menace is, the theatrical version is definitely better than what appeared on the dvd, and having the untouched original mix is always a good thing.