There are two major factors you have to consider. How much Resources your website needs and how much Traffic your Website will get.
1. If you are running a Resource heavy WordPress (or Drupal, Joomla, MediaWiki, Magento, Zen Cart, Medium, Ghost or any other CMS) website and you also expect a lot of visitors we recommend WordPress Hosting.
2. If you are tight on Budget and your Website has mostly Static elements or you don't expect a lot of Traffic a Budget Plan should be an Optimal choice.
3. Anything between the two above fall in the Shared Hosting category. There is no clear answer so Upgrades and Downgrades are available to all Customers!
Just to make it clear, you can't make a wrong decision as all of our Hosting Plans can support all kind of Websites, so don't be afraid to try out any of our Packages!