Dear Andrea, I believe that the general consensus is that the THX color timing is the one worth pursuing. Though the THX is probably not completely accurate to the 1978 color timing (in fact it may be quite revisionist), many seem to agree that it looks aesthetically the best. It seems using this timing would please most people.

The laserdisc, while possibly more accurate, does seem a bit brightness-boosted. Also, the colors are not as rich and vivid as the THX release, which all of us seem to love so much.

I'd recommend just sticking to the timing of the THX. Only do a second release if you really feel like it, but let the second definitely be the LD-based one.