xml vs json

Which is the best / native way of loading data and controlling grid, xml or json.
From the documentation, seeing there is not much json examples (only load data) , I got the feeling, I better be focusing on xml.
u sure used it, acn u tell me which one is the one to use, or both has the capability of loading and calling actions all sorts of.

Historically xml was the main format of data loading for grid, so most samples use it.
Currently it doesn’t really matter - data format is abstracted from the inner logic, so both json and xml are works equally well.

The only major difference - “Configuration from XML” feature, which has not JSON equal.

From performance point of view - it works equally well for both formats, if you are loading tens of thousands of rows - xml may be a bit faster. But in case of more sane data amounts - difference is marginal.