If you are asking this question, and you are on a 64-bit system, there is only one correct answer – Linux Mint with the Cinnamon desktop.
If you are already a Linux user, you wouldn’t be asking this question. You would know that there are hundreds of different choices. Too many choices is a bad thing for someone new to Linux. But is good for those needing more options, customizations, and tools.
And if you are asking which version of Linux to install, then you probably know why Linux is the best operating system. You probably know it is the most secure operating system. It is free for ever and its source code is open to see what the program is doing, or to modify it if you know how to.
The next question is how to get a copy of Linux Mint for yourself? There are two ways, the first is more techy than the second.
Burn it unto a DVD disc or, if you don’t have a DVD drive, a USB flash drive. Direction to do this are here.
Just remember: Linux Mint is not Windows. Google Chrome and Firefox both work great in Linux Mint, but many Windows programs will not work in Linux. There are alternatives to most Windows programs, but do your research before you make the switch.