MVC & Caching



I've read several articles about caching.
Some of they say, that the caching should happen in the model, other say that it should happen in the controller.

(ATM i'm always reading & writing in the controller and never in the model), but i thought very often, that it would be much better in the model, because i could use model->getFromCache() instead of
$cache = cache::getInstance();
if ($cache->read('myKey..');
$foo = $model::read();
$cache->write('key', $foo);
What do the xenforo coders/addon coders think?

I know there is no "real way", it's like the discussion about fat model vs fat controller^^

Edit: nevermind, i've saw that xenforo provides already cacheaccess in the model:)