PCWorld put a wide range of laptops through the wringer in 2007, and found the model that ran Microsoftis Windows Vista operating system the fastest was Appleis MacBook Pro. The MacBook Pro beat out offerings from Dell, Toshiba, and Alienware.
PCWorldis The Most Notable Notebooks of 2007 report said "The fastest Windows Vista notebook weive tested this year is a Mac. Try that again: The fastest Windows Vista notebook weive tested this year--or for that matter, ever--is a Mac."
Appleis pro-level laptop beat out the Gateway E-265M by only one point with an overall score of 88 in PCWorldis WorldBench tests. The reports added "The MacBookis score is far more impressive simply because Apple couldnit care less whether you run Windows."
The bottom line: It looks like the best platform for running Mac OS X and Windows is a Mac.
[Thanks to TMO reader photodan for the heads up.]