Event handler

Hi

I was wondering which one is faster - technically

If i set the class alias inside eventhandler

[EventHandler(MFEventHandlerType.MFEventHandlerBeforeCheckInChanges, Class = "CD_ALIAS")]

public void MyEventHandler(EventHandlerEnvironment env)

{

}

or if i set a filter search and check myself inside an event handler?

public SearchConditionsJA TargetFilter;

Thank you