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#11
It's not a question of which is better than the other; I have OS X, Ubuntu, and Windows 7 on my desktop. The former two I find are better for everyday use because they are far better at memory management; ie one misbehaving application will not affect other running applications. Also, they have totally different systems for managing running processes. And you can run most Windows applications (including Valve games like Half-Life 2 and programs like Internet Explorer) using WINE, which is not an emulator, but a compatibility layer (WINE stands for WINE IS NOT [AN] EMULATOR). All of those things you mentioned are available on Linux. Open Source software provides the same or better equivalents to closed-source software. And a lot of them are also available on Windows (Pidgin, GIMP).