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Exactly!

Android is popular in market now a days and iPhone development is bit costly too. So you can go for android application development.

Responsive websites are better. Designing mobile website can be complex and you have to re-do all meta tags, content, redirections etc. For responsive you just have to re-size the same website for...

To brief you, HTML has defined tags you can not change them while XML allows you to create your own tags(customized tags) and use them accordingly.
refer...

Both have their own importance. HTML5 and silverlight, both have their purposes and uses. If possible go for both.