I'm not very familiar with the specific security features promised by Microsoft to be included in Windows Vista. But reading other posts, if Windows Vista is not supposed to have programs running in Administrator mode than I'd say this is similar to SELinux and GR Security in the linux world. Therefore if you compare Windows Vista to Linux running in either of these two modes as root it seems that Linux is more secure.
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I'm not very familiar with the specific security features promised by Microsoft to be included in Windows Vista. But reading other posts, if Windows Vista is not supposed to have programs running in Administrator mode than I'd say this is similar to SELinux and GR Security in the linux world. Therefore if you compare Windows Vista to Linux running in either of these two modes as root it seems that Linux is more secure.