First variant. Because google has best world-wide servers.
- Decreased Latency
- Increased parallelism
- Better caching
The best way to initiate jQuery engine:
<script src="http://www.google.com/jsapi"></script>
<script>
google.load("jquery", "1.10.2");
google.setOnLoadCallback(function() {
// Place init code here instead of $(document).ready()
});
</script>
Here is a good article about this:
http://encosia.com/3-reasons-why-you-should-let-google-host-jquery-for-you/