I tried different font settings in the font settings and it didn’t improve much (font hinting, anti aliasing, custom DPI settings, different font size)
The font is the default one which is Ubuntu Regular with font size set to 10
Sub pixel order is set properly to RGB Linux Mint xfce
Even when running windows in a virtual machine, the font rendering in it is miles ahead of what I got on my Linux setup!!!
For a fair comparison you should at least use the same font and font size. Did you try that? It will still look different on windows, maybe better, but I think you can get pretty close. I use the “inter” font on debian xfce and it looks very clean (the font is probably in your repos as well).
Unfortunately it’s not:(
Then just download it e.g. from github: https://github.com/rsms/inter/releases