HTML5 is the newest HTML version and it has tons of new features. New input types, output & input (audio, video) and many more. It is now absolutely necessary for projects to move to HTML5 to enjoy new features.
Drupal is also converting to HTML5 in the upcoming stable 8.0 release. Drupal has started the HTML5 Initiative to convert Drupal to HTML5. Now, this will upgrade Drupal into new heights.
I have been using WordPress for 2 years and haven’t tried out other CMS platforms. I heard about Drupal through the internet and via my I.T textbook of my school. But never got the time to try it out.
Now, I’m a participant of Google Code In, 2014 and Drupal was one of the Open Source organization in it. I tried Wikimedia last year but it was hard, because it was really big for me to work on. This year, I chose Drupal, because that it is a CMS platform used by millions around the world and I thought if many other programmers can work with it, Why can’t I ? Since I already have experience with WordPress, it wouldn’t be hard to understand too.