The templates contain a little bit of code/configuration as a learning example or a starting point for projects. However, this can all be achieved starting with a blank template. The content of the game templates can also be added to a project after it is already created - for example, you could easily add the Third Person template’s contents to a project, if you later find that you need it.
So unless you have a particular reason for starting with a different template, I would go with a blank template.
Hope this helps