1. Pro:
1.1. There are currently very few Linux viruses in the wild, so Ubuntu doesn't come with antivirus software installed.
1.2. Linux is now in a position of offering a viable alternative to proprietary platforms and more than capable of offering a full desktop experience.
2. 2
3. Windows
3.1. Pro:
3.1.1. Windows 8 is Microsoft’s new iteration of its ever-popular operating system, citing close ties to the new Metro interface that has been introduced with the company’s latest smartphone OS.
3.1.2. VMware Player x64 v4.0.1 virtual machine.
3.2. Con:
3.2.1. The Windows 8 experience involves jumping back and forth between the tablet environment (Metro) and the desktop. They have nothing in common. Metro's task list won't list desktop apps and the desktop won't list recently active Metro apps. They're separate and yet you have to use both.
3.2.2. no border, no title bar, and no menu bar on a 21 inch monitor. That's what a Metro text editor would be like to use. Metro apps want to be full-screen. Always. You can snap them to use 1/3rd or 2/3rd of the screen, vertically, but that makes usability even worse in most cases. Take your most common apps and resize them vertically as mentioned and tell us what you think of that. Try getting any serious work done like this.
4. Ubuntu
4.1. Con:
4.1.1. An enormous free software library
4.1.2. Ubuntu is Free & Open Source
5. Mac OS X
5.1. Pro:
5.1.1. OSX Mountain Lion is the next version of the popular Apple operating system and is expected to land at the end of the summer.
5.1.2. OS X 10.8 is Apple’s first release since the introduction of iCloud – their free online storage service.
5.2. Con:
5.2.1. OS X is limited on what it can do.
5.2.2. Basically all you need to do is install the OS X 10.7.3 Combo Updater over the existing messed up installation of 10.7.3.