Conditions are a big factor, as well as the debate of "naturalness" in card magic. Most working pros have "sets", consisting of several unified effects. If you need a force in a set you might want to use a more surefire force than the classic force, simply because you cannot just move on to another effect.
Naturalness is a reoccurring debate in magic. As far as the most natural force, nothing is going to beat a force that matches with the way you've been letting people select cards throughout your set. Naturalness is arguably a construct created by magicians, with the argument that everything you do with a deck of cards seems natural because people are seeing it for the first time.