Many Listeners vs one with Switch statement

Which is more efficient (performance wise):
A bunch of event listeners attached to buttons,
or a single event listener attached to the parent object, containing a switch statement?
Is the difference negligible, or is one more efficient, and why?

Example:

Code:

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button1.addEventListener(MouseEvent.CLICK, function1);
button2.addEventListener(MouseEvent.CLICK, function2);
button3.addEventListener(MouseEvent.CLICK, function3);
..button356.addEventListener(MouseEvent.CLICK, function356);

...corresponding functions

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or

Code:

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this.addEventListener(MouseEvent.CLICK, buttonClick);

function buttonClick(event:MouseEvent):void {
    switch (event.target) {
          case button1:
                sugar += 10;
                break;
          case button2:
                salt += 10;
              break;
          ...etc
      }
}
}

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