I personally have a better result when I am using the neck stripe. In this case, I can use the thumb-and-finger on both sticks. Without it I could use only the thumb on my throttle-rudder stick, because I am holding the radio with my left hand. Also my radio is pretty heavy ( Futaba 9C), so after 15 min flight you start filling it, but I want my hands and fingers to experience no tension, my plane depends on it... . BTW I am not against the "thumb only" style, but I saw the guy who almost crash his plane just because the control stick had slipped from the thumb. This will never happened if you have thumb-and-finger.
Thank you.