1G1R indicates that you will have all the games available for the system without repetitions and giving preferences for the games in the following order of regions EUR>USA>JAP, also all translations of Japanese games are added so far, eliminating the original and leaving only the translated.
I gave it the name "Perfect Collection" to differentiate it from other 1G1R packages, which often include the same game repeated due to considering variations like v.1.01, v.1.02 as different versions. Here, you will truly find one file for each game. We also remove demos, betas, prototypes, BIOS, etc.
*Certain games kept the Japanese version even having an American version like SNK's fighting games where the American versions always contain some kind of sensory.
*Remember that uploading these files does not generate any kind of profit, this package is made based on the Redump/No-Intro package which contains terabytes of content, this content has to be extracted, filtered, reviewed, converted to .CHD and uploaded again (1 week process), so think 2x before criticizing the work of others.