Which is better, Critical Path or Critical Chain

I have heard recently that Critical chain project management (CCPM) is better than Critical Path and that P6 has Critical Path.  But when I looked at the definition of Critical chain, it said that it was better because it looked not only at duration but also at the resources.  Well...doesn't the P6 scheduler do that also?  If the activity type is Resource Dependent, then it looks at the availability of the assigned resources and the finish date is updated to show any necessary changes, right?  So what does Critical Chain give you that P6 doesn't?

Thanks!