I don't see how that would affect a screenshot—the difference is clearly visible in screenshots. Furthermore the differences between Mac, Linux, and Window font rendering are widely discussed on the internet. I think I just prefer the way that Apple chose to render fonts.

This blog post seems to lay out the tradeoff between, at least, Windows and Mac font rendering: https://blog.typekit.com/2010/10/15/type-rendering-operating...

Yes, there is an issue with freetype where the gamma is different between otf and ttf fonts. otf will apply the gamma automatically, but for ttf you have to force stem darkening at the current time.

Full hinting is a must-have if you turn AA off and use fonts that were designed to be hinted to a pixel grid.

Fonts have several distinct periods where they were designed expecting that renderers would function a certain way. File format notwithstanding, one size does not fit all. You really do need to match your font to your renderer's settings.