I switched to a MacBook Pro in February. I constantly have tons of apps open, crunching away at CPU and using up a lot of RAM. The only time it has ever crashed on me was one time I tried to start Windows XP through Parallels. If you're new to the OS X you might feel less productive for a week or so, but then you'll be way more productive than you were in Windows. If you're a *nix person you'll also feel right at home at the command line.
If you can't choose between Mac or PC, and money isn't that much of an issue, there is no reason not to switch to Mac. You'll have both windows and OS X at your fingertips.
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