I personally use the pinch method 95% of the time. It is a lot more precise for helicopters. However, if I fly 3-D airplanes, I'll use the thumb method for quicker response and wider range of movement. I also prefer a very soft feel on the stick springs. I actually don't want to feel a center position on the stick for helicopters. Airplanes doesn't really matter to me, but a harder spring helps keep cross control out..as long as it's not too stiff.

I teach both method of flying on airplanes and helicopter, but let the student make the choice which they use. It is absolutely a personal choice. No right or wrong here!

Rod