DOS/Windows for a long time was a gaming platform. By which I mean that the only reason to have it installed around was because some very good games worked only on it.
Pointless anecdotes aside: map your requirements. If you absolutely need an application or a game that works best on platform X, choose platform X. Otherwise, it's Linux. Then you only have the tiny problem of choosing a distro :P
(oh and the emulators on Linux are pretty good these days)
Suddendly, I noticed that I'm keeping an OSX box around the house for the same reason. http://www.bay12games.com/dwarves/
Pointless anecdotes aside: map your requirements. If you absolutely need an application or a game that works best on platform X, choose platform X. Otherwise, it's Linux. Then you only have the tiny problem of choosing a distro :P
(oh and the emulators on Linux are pretty good these days)