Which operating system with Microsoft better?

Windows XP

The operating system Windows NT family of Microsoft. It was released on October 25, 2001 and is an extension of Windows 2000 Professional. The name is a portmanteau of XP. experience («Experience", «impressions».
Windows XP was the operating system used to access the Internet in the world until August 2012.
April 8, 2014, Microsoft discontinued support for the operating system Windows XP, this OSes gradually disappear altogether.

Windows Vista

operating system sales for regular users began Jan. 30, 2007.
Windows Vista has won first place in the competition «The failure of the Year» [conducted site Pwnie award, established in 2007.

Windows 7

The operating system is essentially an enhanced version of Windows Vista to optimize performance and bug fixes. Went on sale October 22, 2009.
Support for Windows 7 with no service packs ended April 9, 2013

Windows 8

Went on sale October 26, 2012. According to various reports, on January 2014 the share of Windows 8 in the world among those used to access the Internet ranged from 10.58%
Also remember their commercials:

Windows 10

Get the number 10, bypassing 9. The reason is that many applications considers versions Windows, starting with 9 as Windows 95 or 98
At the time of the survey the new Operating System.
Operating system: Windows 10 is declared as suitable for devices such as: Xbox, computer, phone, tablet, or any other gadget. For all these devices, Microsoft creates a single development platform and a single app store. Members desktop version of Windows 10 will be able to create multiple desktops and switch between them.