What is the best bubble-blowing gum?

I know Big League Chew works really well, and sugary gums are better than minty gums like Orbit and Stride, but is there any official ruling on this issue? Does anyone know why some gums are better for blowing bubbles (like, some chemical that adds elasticity or something)? I am directing a show in which many teenagers need to be blowing big bubbles, and I was just wondering how I would get the best result. Specific flavor recommendations are welcome!