[sspiff]

What does "200%" resolution mean?

I prefer displays with a resolution where I don't have to do any scaling honestly.

[petilon]

200% means double the resolution of the "previous era" (1990s and 2000s), which was around 96 dpi. Modern applications will not see any scaling artifacts.

Applications from the "previous era" that are not HighDPI-aware will get scaling... each application pixel will occupy 4 physical pixels.