Originally Posted by
SeberHusky
To put it short and to the point...it's rarity.
Has nothing to do with what is "the best", how it looks , etc.
Greatest Hits titles are released 1 to 2 years after the original game. If the original game sells well, they make more copies of the games, millions more. Thusly, the original run of the game had a smaller number of pressings for it compared to a Greatest Hits title. Because of that, that makes the black label rarer than the greatest hits title. Now, sometimes they do patch certain glitches or things or add extra content for greatest hits titles, but not all the time, and most don't care about that. (I personally collect for neatness due to my OCD, so seeing all those green borders messes me up.)
The best case I know of this happening is with the Spyro series. People will pay double the price of a Greatest Hits title for the original title (including myself). One example is trying to find the original Spyro: The Dragon as a black label, it's considerably harder to find it compared to the Greatest Hits version.
Back in May 2014, I paid $53 to buy back all the Spyro PS1 games I used to have, complete. I paid $20 each for Spyro 1 and 2 as a black label, but didn't have enough left for the black label of Spyro 3, so I had to cheap out and get the GH version.