1. Windows 8
1.1. pros
1.1.1. 1. The new UI will help merge the tablet and PC markets and allow PCs to benefit from touch capabilities.
1.1.2. 2. Windows 8 will run from a USB drive even when older version of windows are installed on the host.
1.2. cons
1.2.1. 1. This is a revolutionary version, users will need a lot of training
1.2.2. companies will have to upgrade their hardware to take advantage of the interface
2. Market Share
3. Mac OS X
3.1. pros
3.1.1. 1.At this time it has fewer viruses that can attack it, so it is safer then Windows for now. It is built on a Unix core which is very secure and the standard for the business world.
3.1.2. 2.Great programs for the artistic minded (journalism, photography, moviemaking, etc..)
3.2. Cons
3.2.1. 1.Windows is still the premier gaming PC, you can still run many games on Mac OS X but not all of them.
3.2.2. 2.speed wise it can be slower with 3-D rendering and graphics intensive programs even if you have the best Mac you can buy.
4. Ubuntu 12.10
4.1. pros
4.1.1. 1.
4.2. cons
4.2.1. 2.