I have touched and installed Windows and Linux already. And now, I am planning to install double system, Windows and Mac OS. My phone is 1+ 6 with Android system, and I never used an iPhone or iPad, so I am not familiar with IOS system. Windows is created by Microsoft, and it’s the most common system among ordinary people. It based on images instead of instructions, it’s easier to understand and operate. As for Linux system, it’s a system based on instructions. If you want to open a folder, you only need to double click the icon in Windows, but in Linux, we directly use the path and instructions to open it. Obviously, Linux is not a good choice to be a domestic system, so most of the users are programmers and enterprises. Android system is very common, which is used in most of smart phones. And it’s the most powerful enemy of IOS.