Which of those TQs is easier to apply to ones self. As as example, in the video the guy applies the TQ to his left arm using only one hand.

In the Wilderness First Aid course we learned to fabricate a tourniquet from available items. IIRC I used a triangle bandage and dont recall what was used as a windlass, but that too can be fabricated; its not rocket science. However, the TQs were being applied to another student in the class and not to ourselves. The ability to apply one to your own arm using only one hand, is a good reason to carry and practice with a purpose built item.
Better is the Enemy of Good Enough.
Okay, whats your point??