Which you choose for your web app XML, JSON, or HTML?

If you are a Ajax developer you should know these three words XML, JSON & HTML (using innerHTML)

So which you will choose the best to get your data from server to manipulate on client browser? if you are not sure about this then read following article

What's Your Poison? XML, JSON, or HTML? by Jeremy Keith

which is a part of his book Bulletproof Ajax. The article is here:

As for my preference I use HTML as it is very easy way and safe also, read the article and decide what is best for you.