1. Windows
1.1. Strengths
1.1.1. Windows OS is very user friendly http://blog.eukhost.com/webhosting/ubuntu-12-04-an-even-better-alternative-to-windows/
1.1.2. Microsoft, meanwhile, has been early at bringing touch to the desktop and laptop. Windows 7 offered built-in multitouch support http://allthingsd.com/20120216/apples-mountain-lion-and-microsofts-windows-8-both-aim-to-make-desktop-more-like-mobile/
1.2. Weakness
1.2.1. Microsoft has struggled with a similar approach in the past, noting that Windows Mobile initially aimed to replicate the Windows desktop down to the start menu — an approach that was not popular with consumers. http://allthingsd.com/20120216/apples-mountain-lion-and-microsofts-windows-8-both-aim-to-make-desktop-more-like-mobile/
1.2.2. It’s changed over the years, but you could take someone who last touched Windows back in the Windows 95 days and drop that in front of them of Windows 7 and they’d be able to get work done. Metro? It’s entirely different. Heck, Microsoft has even dropped the Start button in the latest version! http://www.zdnet.com/blog/open-source/five-reasons-why-windows-8-will-be-dead-on-arrival/10275
2. Mac OS X
2.1. Strengths
2.1.1. OS X has its own app store http://techreviewsandhelp.com/2012/02/12/os-x-vs-ubuntu/
2.1.2. OS X features multi workspace but with compiz you can do special tricks with the workspace. http://techreviewsandhelp.com/2012/02/12/os-x-vs-ubuntu/
2.2. Weakness
2.2.1. OS X requires you to buy these basic applications to do every day task. http://techreviewsandhelp.com/2012/02/12/os-x-vs-ubuntu/
2.2.2. OS X requires luck or some knowledge to use all the basic features. http://techreviewsandhelp.com/2012/02/12/os-x-vs-ubuntu/
3. Ubuntu
3.1. Strengths
3.1.1. A dedicated app for browsing and buying games http://www.omgubuntu.co.uk/2012/02/mountain-lion-features-ubuntu/
3.1.2. Virtual Desktops are perhaps the most impressive ‘wow' feature of Ubuntu http://nerdbusiness.com/blog/ubuntu-advantages-over-windows-mac-osx
3.2. Weakness
3.2.1. Ubuntu is still not as user friendly as Windows is http://blog.eukhost.com/webhosting/ubuntu-12-04-an-even-better-alternative-to-windows/
3.2.2. Ubuntu is still not 100% compatible with a lot of hardware http://blog.eukhost.com/webhosting/ubuntu-12-04-an-even-better-alternative-to-windows/