When the ClearType tuner gives you this choice:
![]()
This is what you're really choosing between:
![]( "Image: https://i.imgur.com/eTqcfwg.png")
If you simply disable ClearType, the renderer is classic GDI, this is what it renders.
![]( "Image: https://i.imgur.com/SQzMR5L.png")
and of course text in classic GDI is anti-aliased vertically too, because ClearType GDI has a (probably intentional) glitch in most versions of Microsoft Windows that have ClearType where it would disable vertical anti-aliasing regardless of the gasp setting.
This is what you're really choosing between:
If you simply disable ClearType, the renderer is classic GDI, this is what it renders.
and of course text in classic GDI is anti-aliased vertically too, because ClearType GDI has a (probably intentional) glitch in most versions of Microsoft Windows that have ClearType where it would disable vertical anti-aliasing regardless of the gasp setting.