It’s not necessarily the best - like with the succes/bad choice beeps it’s more about the amount of content and available perversion points (Although Ending 3 is usually zero sexual content). It’s also slightly misleading - e.g. In the scene with HanZi or Fiora there are actually 5 endings, each with several permutations, so ending 1 applies for the completely different f/m and m/m routesI didn't know 1/3 was the "best ending" of each path, I figured it just told me how many endings existed and which I got.