title: grpc and zeromq comparsion
body: <p>I'd like to compare somehow capabilities of grpc vs. zeromq &amp; its patterns: and I'd like to create some comparsion (feature set) - somehow - 0mq is "better" sockets - but anyways - if I apply 0mq patterns - I get comparable 'frameworks' I think - and here 0mq seems to be much more flexible ...</p>
  
  <p>The main requirements are:</p>
  
  <ul>
  <li>async req / res communication (inproc or remote) between nodes</li>
  <li>flexible messages routing </li>
  <li>loadbalancing support</li>
  <li>well documented</li>
  </ul>
  
  <p>any ideas? </p>
  
  <p>thanks!</p>