I got this information from my own experience of using both of them. Since I am the kind of person who's handwriting is usually very dark and big, I, of course, have a tendency to push very hard on my pencil. Using a pink eraser, I noticed my handwriting would never fully erase, because it was so dark. A white eraser really helps more. It completely erases my dark handwriting and drawing lines until the paper is as white as it was before. A pink eraser leaves a dark mess and an imprint of what I had written earlier, which is why pink erasers aren't my favorite to use.