title: WebActivatorEx vs OwinStartup
body: <p>In a WebAPI application for example, what is the difference between</p>
  
  <pre><code>[assembly: OwinStartup(typeof(MyClass), "MyMethod")]
  </code></pre>
  
  <p>and </p>
  
  <pre><code>[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(MyClass), "MyMethod")]
  </code></pre>
  
  <p>?</p>