Many confuse hardware differences (low-DPI versus high-DPI screens) with operating system differences.
Windows has had sub-pixel text alignment and LCD-oriented anti-aliasing ("ClearType") for, what, a decade? Text on my 267-DPI Surface Book looks absolutely amazing, and obviously text on a 226-DPI Macbook will look great as well.
For those who are not confused by hardware differences, I suspect the remaining matters are taste and familiarity. Having used Windows for a long time, my preference is for Windows' rendering and I find the rendering on macOS to be odd and uncomfortable. I'm struggling to find the right adjective—perhaps too comical or whimsical? Overall font selections and rendering don't seem as crisp and professional as on Windows.
Windows also supports ligatures and advanced kerning, so text on a web browser with good Windows API support (e.g., Edge or Firefox) looks fantastic. (Chrome was a notable laggard here, refusing to use modern Windows text rendering APIs for a very long time.)