Parallels will probably be a worse solution unless you're really tight for space.

Why? Because it's virtualization. It's running Windows inside OSX, which means that OSX is still running and everything you do in Windows has to be...translated, I suppose, so that OSX knows what to do.

I don't know how good Parallels is, but it'll definitely be at least 10% slower than boot camp. (If other virtulization software is any guide that is. In fact, most goes closer to 20% slower.)
(Or so I understand. I must confess that I don't use virtualization software at all, and I may be out of date in how efficient it's gotten.)


Also, doing some reading, if you have a multicore CPU or multiple CPUs on seperate dies Parallels will only be able to use one of them, whereas Windows can use all of a multicore CPU's processors (and Vista Business and up can use multiple CPU dies.)

__________________
"Science is the poetry of reality." ~ Richard Dawkins