Which OS is better Windows 7, Windows 8 or Windows 10?

windows 8.1 is the best for me comparation i think windows 7 

For me Windows 7 because it is very user-friendly

Win XP Click on Start button, then go to Control Panel, click on Regional and Language Option. Click on  "Languages" tab, then check that box "Install files for complex script and right-to-lift languages (including Thai). Click on  Apply, then Ok. Note: It is possible to ask you to insert the language package CD or Win XP BootCD   Win7 Click on Start button, then go to Control Panel. In Category view, click on Clock, Language, and Region link. [+] In Icons view, click on Regional and Language icon, and then go to Keyboards and Languages tab Click on Install or uninstall display languages under “Region and Language” section or Install/uninstall languages under “Display Language” section”. In the “Install or uninstall display languages” wizard, click on Install display languages. Click Browse computer or network to locate and install language packs manually. Type or browse to the folder that contains the language pack files. The language file must be in .CAB extension, typical named as “lp.cab”. [+] Once selected and if at least one valid language pack (either MUI or LIP) is found, the wizard will list all languages available to install, together with native name, type (MUI or LIP) and size. Tick the check boxes of all languages that want to be installed. Actually, the check boxes are checked by default, so you should untick and uncheck the check boxes of display languages that don’t want to be installed. Click on Next button when ready. Check the radio button for I accept the license terms, then click on Next button. Wait for the installation to finish, which may take a while. Once all selected language files is installed successfully, a confirmation screen will be shown. [+] Click Next button. If you wish to change to new display language, select the desired display language from the list of languages available. Then, click on Change display language button. Optional is whether to also apply the new display language to welcome screen and system accounts. Else, click on Close button to exit.   Win8   Method No.1: Press Win key In Start Screen write lpksetup Press enter and follow instructions After the successful installation, restart and enable the new display language in Control Panel\\Clock then Language and Region then Language   Method No.2: Press Win key In Start Screen, write cmd Right mouse click over Command Prompt and select Run as Administrator Write the following command, Restart afterwards and enable your display language in Control Panel: dism /online /add-package /packagepath:C:\\languagepacks\\de-de\\lp.cab   NOTE1#: You will need to adapt the commands requirements for your specific usage, for instance, if i want to install a pt-PT language pack that is located at c:\\users\\me\\lpacks\\pt-PT\\lp.cab, the command would be dism /online /add-package /packagepath:C:\\users\\me\\lpacks\\pt-PT\\lp.cab   NOTE2#: Don’t forget to change your Locale settings also, so you can get the same language everywhere.

My answer would be Windows 10 the reason is because it's offered free and life cycle support makes it windows 7 End of mainstream support was January 2015, windows 8 January 2018 so sooner or later you will have to upgrade, regarding government and large companies they are counting on the extended support but will end up upgrading as well.

For a basic user that runs applications only for daily basis I would suggest Windows 7 as the best and Windows 10 is the second best one. Windows 7 uses less resources than windows 10 and supports almost everything, but windows 10 is more stable and well organized. For windows 8.1, I think it's out of the competition because it's not stable and use high amount of resources. 

Windows  7 is the best  for me