The thumb technique allows you to carry out a smoother nocking motion compared to the Mediterranean technique. As the arrow is placed on the right side of the arrow, it doesn’t have to be threaded between the string and bow arm. Of course the nocking procedure demonstrated here requires some practice. Its big advantage is that it allows you to keep the target in sight throughout. In addition it looks smoother and in my opinion also more elegant.
Before I start nocking, I need to pick up the arrow and again this is easier. I don’t have to grip the arrow at its notch, but can just hold it anywhere along the shaft; again this is much easier to do without looking.