Dado Blades...

Have a few wood working projects that need to be done here soon. Thinking about using a Dado blade to cut channels in the legs of the shelves that I will be building. Is one style "better" than the other? We have a belt driven Rigid table saw, the model prior to this one. Going to build a bunch of other things down the road as well so the $$ of buying a good blade set is not much of a concern....