<p dir="auto">The second one looks like a duplicate of 2.0.0-alpha.33 (2015-07-30).</p>
<p dir="auto">I just ran through the demo for Dart here:</p>
<p dir="auto"><a href="https://angular.io/docs/dart/latest/quickstart.html" rel="nofollow">https://angular.io/docs/dart/latest/quickstart.html</a></p>
<ul dir="auto">
<li>Running through the built in Dart2JS transformer via pub serve results in a 5.2 MB main.dart.js file</li>
<li>Running through pub build results in a 2.5 MB main.dart.js file</li>
</ul>