LaserDisc stores the video signal in an entirely analog format on the disc, similar to a vinyl record but using lasers. In theory, under good conditions, the input signal is almost entirely reproduceable on playback (minus some degradation in the form of noise and dropouts).
The end viewing result should be something very close to the master tape that was used to make the LD discs, which in this case should be the same tapes used to broadcast the show on TV.
DVD uses the same resolution and video format as LD but digitized, so it’s pretty evenly matched and DVD has better numbers on paper, but where it fails is its use of lossy compression (MPEG2) to fit all that data onto a disc which visibly degrades the image quality quite a bit. This issue is compounded because they chose to jam multiple episodes onto a single 4.7gb disc plus various extras and bullshit resulting in even lower video quality.
If only Paramount would get off it’s ass and make a BluRay release…