Completely anecdotal;
I'm in a university film program. A lot of my fellow first year students bought macbooks because they were led to believe by multiple sources that they were the best machines to get for video editing. After a couple of projects, most of them heavily regretted it. Meanwhile, those of us using machines running windows were doing fine.
Go figure, more powerful hardware for less money is a good thing.
To be fair, Macs do come pre-loaded with better video editing software (being better than Windows Movie Maker isn't really an accomplishment). However, with the money you save not buying a Mac, you can easily afford something better than either.