Callback or custom event?

gistfile1.txt

Hey, I’m playing around with a multitouch gesture recognition API
for Mobile Safari. Now I’m wondering; would you prefer to define the 
event handler in a callback, like this:

recognize.tap(element, function() {
  log('Tapped');
});

Or would you prefer the recognizer to fire a custom event, like this:

recognize.tap(element);
element.bind('tap', function() {
  log('Tapped');
});

Which one do you like best? Why?

@mislav I’m familiar with Zepto but for anything but trivial multitouch support you can’t get away from having to define gesture recognizers.