Cash or credit - carrying which is better for you?

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And by better, I mean which method of payment helps you control your budget better? Or do neither? I've talked about this with customers at work as well as friends & family and it seems like everyone has conflicting answers. Some people think that carrying cash around is better, because they're less likely to spend their money - because they can SEE it right in front of them, and know exactly when they're running out (instead of having to balance their checking or check their credit limit and so on, depending on what kind of card you have). Other people think that cash isn't the way to go because they're MORE likely to spend money when they have cash on hand, and also because they feel less likely to use their cards on stupid, "small" purchases, like a soda at the gas station. (Well, it doesn't stop me any..LOL.) What do you think? When keeping a budget, which is the better way to go?