None of them. If you compare them to a print, they are all off. The SC is in the correct spectrum but the saturation is way too low and the colour is way off in some areas. The THX laserdisc releases are closer to correct saturation, but the tint is off. The bootleg tapes are also not all that close. The PAL THX ones are closer than the NTSC ones.
The only reliable source is a print, anything else and you are only matching to the telecine colourist's choices of the day.