I have this one on an MGM double feature DVD. The two films are "Invasion of the Star Creatures" and "Invasion of the Bee Girls." The quality is decent. Not up to par with most DVDs, but better than my VHS I used to have. Also, it appears to be the original aspect ratio of 1.85:1. I have not seen the "Graveyard Tramps" DVD version, but it appears to be 1.33:1, along with being a Brentwood DVD. I would think the quality would be lower than the MGM one.
The Double Feature DVD on Amazon.com(That link does give me credit if you buy the movie. If you jump to Amazon.com and search for "Invasion of the Star Creatures" under DVD it will come right up.