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I think the ball is best if you don't have good form during crunches. They help keep you in line so that you're doing the exercise correctly. But, like Sikes said, you'll get a better work out if you learn to do crunches correctly (by doing the exercise slowly, bringing your whole body up, keep your body straight, and hold your position for 5 seconds).
It's kinda like free weights vs. machines. You get a better work out from free weights because you're trying to maintain balance and coordination while lifting but the machines are good if you can't keep yourself steady enough during the exercise (and to decrease the risk of injuring yourself).
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ZTA
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