title: $TemplateCache or TemplateUrl for directive
body: <p>I have $http.get all the html templates into the $TemplateCache, my question is for my directives is it more efficient to use </p>
  
  <pre><code>TemplateUrl : abc.html 
  </code></pre>
  
  <p>or </p>
  
  <pre><code>Template : $TemplateCache.get('abc.html')? 
  </code></pre>