Answer 1

In my opinion, each major os has its ups and downs.

Chrome is web-based, which is powerful, but can be a bad thing if you can't get an internet connection.
Windows 10 focuses on functionality and flexibility, but can have inconsistencies. Still, its a major improvement from Windows 8 (who wants a start SCREEN?) It rules for "regular" desktops, but for the most part, not mobile (at least phones)
Apple can be behind sometimes in specs, but does create a beautiful user experience. Its strange how when they leap into a new category, and redefine it. When a new tablet comes out the question isn't "how does it stack up against a surface?" but "how does it stack up against an ipad?"
Android, like Windows, has copied Apple from the start, but eventually developed it own features. The iphone doesn't have a heartrate sensor or as much 3D support.

As you might have guessed, I am a mac fan. The only features I'd miss from Windows is snapping windows, seeing the speed of transfering files, and maybe the news app. Otherwise, I love the perfectionist, minimalist view of Apple.

Of course, you probably have your own opinion. No OS is necessarily "better" than the other. The beautiful thing is that each spurs the other on to become better, and keeps the other from being incompetent or too powerful.