What is the benefit of Node Blocks module versus adding content to blocks in body field?
Nodeblock


  This module allows you to specify content type(s) as being a block. This > allows > the content managers of the site to edit the block text
  and title without having to access the block administration page.
  Users only need edit access to that node in order to edit it.


Also, based on above I imagine that you don't need to assign the block a region and a "display only on url". (I could be wrong, never used this module).