1. Windows 8
1.1. Pros:
1.1.1. 1. Faster boot time - The boot process will take 8 seconds
1.1.2. Windows To Go - Windows 8 will run from a USB drive even when older versions of windows are installed on the host.
1.2. Cons:
1.2.1. No start menu - Microsoft has pulled the Start button off the legacy interface, complicating any Windows 8 roll out in a corporate environment.
1.2.1.1. Need for massive training - This is such a revolutionary version, users will need a lot of training and practice.
2. Mac O S X
2.1. Pros:
2.1.1. 1. i Cloud integration and syncing features give you the same experience on all your devices.
2.1.2. 2. Upgrades to several core apps bring new and useful features for sharing and social connectivity.
2.2. Cons:
2.2.1. 1. Game Center, while finally available for Mac, still only has basic features.
2.2.2. 2. Dictation sends your voice to be translated at Apple servers, so you can’t use it while offline.
3. Ubuntu 12.10
3.1. Pros:
3.1.1. 1. Popular desktop Linux distribution based on Debian, with a fine pedigree.
3.1.2. 2. Works flawlessly on most hardware.
3.2. Cons:
3.2.1. 1. Ubuntu's controversial desktop shell, Unity, has still to mature.
3.2.2. 2. Recent trends towards 'commercialization' (the addition of online shopping 'suggestions' to the Dash search results) have annoyed some users.