MacBook Air with Parallels accessing Virtual machine or Boot Camp?

The MacBook Air video card is very limited to run HD movies, and when you run Parallels accessing a Vm, the video performance is very poor. I would like to know if installing Windows through BootCamp, could increase this performance.
1 - Any one knows if there's some advantage on installing Windows through BootCamp instead of Vm?
Note: One desvantage is that TimeMachine can not auto backup BootCamp partition, but it "yes" do backups the Vm.
Thank you very much in advance!

ayeying said:

Advantages: you can run xp with full performance if you need to.

Video Card performance doesn't do anything in virtual machines much unless you're doing 3d graphics.

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Thank you "ayeying" an thank you "Unprocessed1" for your prompt support. Another doubt is:
Are there differences in video performance on booting the Mac machine in Windows, than to boot the machine in Leopard+Paralles accessing the BootCamp?
I'm asking this because I have contact Parallels team, and they told me that there's no difference in video performance when you use Parallels+BootCamp, but I still doubt this.