1. Windows
1.1. Pros
1.1.1. Improved mobile broadband support and better instant-on and instant-off abilities
1.1.2. Supports the power-savvy ARM chips found in phones and tablets
1.2. Cons
1.2.1. Some features will not be compatible with existing computer hardware
1.2.2. Start menu is lacking, only four options
2. Ubuntu
2.1. Pros
2.1.1. It boots quickly at 12-14 seconds
2.1.2. Free photo editor
2.2. Cons
2.2.1. Lack of customisability
2.2.2. Still not 100% compatible with a lot of hardware
3. Mac OS X
3.1. Pros
3.1.1. Automatically 'syncs' data with the service when you first log in
3.1.2. 10.8 introduces ‘Share Sheets’ – a small, in app button that lets you share whatever you’re looking at/working on with social networks.
3.2. Cons
3.2.1. Requires you to buy basic applications, like photo editor, to do everyday tasks.
3.2.2. Minor interface inconsistencies