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Beware the man who only has one gun; he probably knows how to use it.

In the general case, you should use one and the same concealed carry weapon in the same mode of carry (holster, position) as often as possible. There are however instances where your primary carry will not work. This could be due to clothing (what works with a suit may not work with a shirt and tie and vice versa), social surroundings (if people are going to be hugging you, they'll find a waistband holster and you should thus avoid it), your planned activities (an ankle holster doesn't work well for running, and neither does a clipped IWB holster really), etc. In addition, it makes good tactical sense to always have more than one gun available and have at least one that can be accessed by each hand or while in different postures. If you're sitting in the car, you cannot easily reach a weapon in your waistband either because of the seatbelt or simply because you're sitting. You CAN, however, reach a shoulder holster relatively easily, IF you have the use of your right arm.

You begin to see the complexities involved in choosing ONE weapon carried ONE way. It may be impossible to to find one method of concealed carry that ALWAYS works.