The former, and it seems to vary by location. from the article:

   [...] search results for hotels in cities including Las Vegas,
   Orlando, Philadelphia and Boston were the same for both Macs and PCs.
   A New York search turned up more expensive hotels for Mac users, but
   only after the first 20 listed.

   [...] A Mac search for a hotel in Miami Beach for two nights in July
   displayed costlier boutique hotels on the first page of results, such
   as Sagamore, the Art Hotel and the Boulan South Beach, that weren't
   displayed on the PC's first page. Among hotels appearing in both searches,
   some pricier options (such as the $212 Eden Roc Renaissance and the $397
   Fontainebleau) were listed higher on the Mac. [...]