It is my feeling that for a cabinet which will be supporting weight you are better off using dados. Here is why I say this: We all know that the more glue surfaces you have in a joint the stronger it is. The dado has 3 while a pocket hole joint has one. In fairness the pocket hole joint does have the screw which acts as a powerful clamp on its own. So what happens when you introduce an impact to the joint? We have all seen screws pull out. The same impact applied to a dado joint will have the wood pushing down on a lip of wood with 3 times the glue to help support it. This just strikes me as a stronger joint. We all know how easy it is to drop something on a table. I guess in 50 years there will be enough data to give us proof one way or the other.
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Mike
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