Well, the obvious thing is that one set of cables was sent to LucasArts and they tested them to make sure they were MINIMALLY ACCEPTABLE. (THX is like the "Good Housekeeping" of the AV world).
In truth, the coax in both cables could be identical, but with different RCA plugs, or identical plugs with different jackets.
Since Monster does not publish frequency response specs, it is difficult to tell.
While the Monster cables are decent, ask yourself: what brand of cables do the production studios use?
The pro's buy a large spool of coax and custom-build cables for all their equipment. Some of the techs have started a side-business selling custom component cables over the internet.
Do a search on this forum for "Canare" and find lots of posts about these sites. (Canare and Belden are two of the best manufacturers of coax in the field.)
And I always suggest you follow the 10% rule: take 10% of your electronics price (DVD and TV) and budget this ammount for the connecting cables. If you spend less than the 10% - you've got a bargin, spend more and you may be putting speed-rated tires on your Yugo.