I like the overall UI consistency of macOS, both in terms of design and features. I like that most applications are not covered in controls, but have the essential controls on a toolbar (that is often customisable), a bunch more options in the menu bar (just compare Finder to Windows Explorer) and a single place for app settings. I also like that system-wide settings are much better organised in macOS, whereas in Windows they are spread across at least two programs (Control Panel and the Settings app).
I have also come to appreciate the rich scripting and automation support of macOS that works across the system. This would help me so much on my work computer, where the best thing I have is macro support in Microsoft Office.