Best Development Paradigm (XML/JS/JSON/HTML)

Hi,

I'm trying to figure out which development paradigm is the best practice in our Mobility project. We have following options.

1. XML

2. JavaScript

3. JSON

4. HTML

I searched in SCN and found some people preferred XML over another but there are also threads recommending JS. Please advise me what is SAP's best practice and the way to go in future. Thank you in advance.