CTs newest article talks about cortisol and how it's released to generate energy by using your glycogen. The longer the workout, the more energy needed, which can lead to increased cortisol for us naturals.
The Best Damn article and the one you referenced advocate failure. Based on 3 Reasons You Can't Train Like A Juicer I'd say the Best Damn workout might be the better approach because it'll be a shorter workout and still achieve the muscle failure you desire.
CT also admits he's still learning so the newer workouts are adjustments on old things to give the best programs possible.
Hope this helps. Only my opinion and interpretation of CTs stuff.