This document compares the operating systems Mac OS, Windows, and Linux/Unix. It provides information on the history, developers, source models, and platforms supported for each OS. Key features like price, security, and usability are compared. System requirements for memory, storage, and processor are outlined for MacOS, Windows 10/11, and a typical Linux distro. Pros and cons of each OS are discussed for different user types. In the end, MacOS is recommended for office/school work due to optimized software, Windows is best overall due to wide industry support and gaming, while Linux offers best resource utilization and is open source.