For desktop computers, either Windows or Linux. Windows on my main computer since I rely on so much Windows-only software (MS Office, Many Games) despite the BS that Microsoft does to windows in new versions, but Linux has gotten way better lately, especially as it picks up new users as Windows declines. MacOS to me the worst of both worlds when it comes to lack of software support and corporate BS
For Mobile, definitely Android. Android is what I wish Linux was for Desktop computers; Loads of software you can get from many places, open source, and not locked down. It’s mainly the way it is because for Mobile OS’s, Microsoft was spending too much resources shooting itself in the foot with the Zune than to make the necessary improvements to make Windows Mobile to be competitive, and by the time they realized their mistake it was too late. iOS is such a pain in the ass for me to use due to how locked down it is, and while it has more software support than MacOS, its locked down nature and being mostly restricted to getting software from Apple means that several apps that I rely on (including a few apps not on the Google Play store) will never be available for iOS. I also like to see where every single file on my phone actually is
I generally use the OS which fits what I am trying to do. For my desktop PC, I run Arch Linux as it lets me game, run VMs and have a high level of control over what the system is doing. The VMs are mostly Windows for testing stuff and one running Ubuntu as a host for PolarProxy. My server runs Ubuntu, though really just as a platform to host docker containers. That was a decision I made years ago when I knew a lot less about Linux and was looking for something which was more turnkey. My work laptop is Windows, because my work is mostly a Microsoft shop. But, I have WSL running both Ubuntu (for the SANS Sift framework) and Kali.
An Operating System is a tool. Don’t get wedded to any one OS.
