There is no magic shot, each bunker has its own set of problems in trying to get out of. Some you can flop out of, some you can pitch from, some you are sitting too low to flop or pitch and the ball hits the top ridge and sticks, so you need to learn to dial in a punch shot or a full wedge.
Fairway bunkers have another whole set of issues. 10-15%? hit pretty much any iron. Deeper and its anyone's guess.
It's just practice, and remembering what you hit last time and adjust. Good luck.
~~Sammi~~