Because it's a dumb comparison. Ubuntu provides at most 3 or 4 different default...

Daishiman on March 4, 2010 | parent | context | favorite | on: Ubuntu introduces new theme and branding

Because it's a dumb comparison. Ubuntu provides at most 3 or 4 different default themes to choose from. If you want more, you can go explicitly looking for them on the web, but otherwise there's not choice overload.