I find the tourniquet method, requires a lot of will to follow through with, especially if you don't lock your stick in place after you've finished twisting it, I've been able to combine the tourniquet and hyperventilation, to get close, but I always end up moving around too much which releases the rod I keep behind my shoulder when my legs give out. The choking part is very easy because you have complete control on where you are choking and how hard you are twisting, so you just go fast with it and you'll start to black out. The hard part is keeping everything in place when you do go unconscious, if you don't do it right you could risk the rope getting loose, which could leave you in worse condition than when you started :/
But don't let my worries dissuade ya, do the method you feel most comfortable with, I just personally feel that the tourniquet method is just partial suspension on hard mode :P