There are pros and cons to both methods. I use thumbs and no tray when flying trainers, floaters, etc and pinching with a tray for aerobatic models. Those who say try both and use what's best for you are right, but I'd just add this: The first time you try something different it will seem strange. So don't try the other way (whichever it is) one time and then quit. Do both until you are comfortable with both, then decide what's best for you.