Yes, this classic flame war. There used to be a Windows vs OSX font rendering flame war every week on HN, in the good old days.

OSX uses antialiasing, which means the fonts have a nice shape, but they are fuzzy, blurry, and to some users headache-inducing.

Windows reshapes the fonts so they fit perfectly in the pixel grid, but the shape is not what will be printed, and it looks ugly to some users.

Because people like what they are used to, and because Apple vs Microsoft is already a flame war, no-one can really agree.