The type of platform you should choose depends on the software you plan to use to power your website.
Generally, you should choose Windows if your website is built in ASP, ASP.NET or requires an Microsoft SQL database.
If your website is built in PHP, Perl, Ruby, or Python then choose Linux. WordPress, Joomla, Drupal and all other Web apps we provide through our one-click installers are optimized for our Linux hosting platform.
If you're only using WordPress, we recommend using our WordPress hosting platform (it has WordPress-specific speed-boosting features).
If you're still unsure, we'd recommend choosing Linux, as this platform meets the needs of most of our customers.