1. Operating System is an interface between hardware and use
2. Mac OS X
2.1. Pros:
2.1.1. More secure than Windows due to its UNIX base
2.1.2. Content creation is its strength.
2.2. Cons:
2.2.1. More expensive upfront than other choices. Some would say this is offset by less maintenance required over the life of the system.
2.2.2. Less support. You have to goto Apple for all your hardware problems.
3. Google Chrome OS
3.1. Pros:
3.1.1. will be securre
3.1.2. You'll be able to connect other devices
3.2. Cons:
3.2.1. You'll only be able to run Web Apps
3.2.2. You will only be able to play Flash games
4. Windows 7
4.1. Pros:
4.1.1. More then 80% of the desktop computers in the world run some sort of Windows operating system.
4.1.2. Most widely supported operating system for games.
4.2. Cons:
4.2.1. The most prone operating system for spyware and virus applications.
4.2.2. Poor security.
5. Ubuntu 10.10
5.1. Pros:
5.1.1. Way more secure than Windows XP and even OSX.
5.1.2. Full access to the free open source library of software.
5.2. Cons:
5.2.1. Limited support for proprietary applications.
5.2.2. The latest and greatest hardware is typically slower to reach Linux.