Right now I will vote Win98SE for pure performance (though I prefer to use 2000, I won't claim it will perform as well as 98SE on all hardware with all games).
But next year, XP will have been released, NT5.x will be the standard for Home, Business and Professional users. I think that drivers will have been optimized for NT5 by then, and new games will be to.
There is nothing in Win9x that makes it a better gaming OS than NT5.
Home users typically use Win9x rather than NT, so game developers optimize for Win9x. Once game developers start optimizing for NT5, and good drivers are built for it, Win9x (Windows 4.x) will start to look like Windows 3.x.
Win2k/XP is definately the way to go for the future of gaming.
LOL@crt1530, my rant is already famous and it's only 2 or 3 days old.
<< (sorry, I am not going to type in little boxes ala 1984, Linux fanboys) >>
That's a little uncalled for, XWindows is just as advanced a GUI as MS Windows, and you can set X to autostart so you never need to see a Linux command line.
But it is difficult to use Linux even with XWin, becuase the software compatiblity just isn't there. So as much as I like to toy with Linux you are right, for the time being MS Windows is the best way to go. Hopefully we will have better software support for Linux in the future, but I doubt it.