At what point is a physical atk better than a magical atk?

At what point is a physical atk better equipped on a caster?

For example. Pryoblast 60p physical vs whirling flame 45p magical on say meniss or some caster like a lupa

It depends on your monsters matk and regular physical attack. Some monsters such as lupa have good matk which makes matks such as whirling flame good for it.it also depends on what monsters you are facing. Some have good mdef and others have good physical def. it just depends on what you are using and what you are going up against.