The Swift is slightly faster than the 22=250. And the key word is slightly. Most of the dramatic claims you hear are simply that, claims. That said, you can't go wrong with either. With the Swift, you would have something that is a little "different", not something you can pick off the wall at just about any gun shop. Kinda like shooting a .257AI as opposed to a .257.
Your gains in velocity and reach will be minor and success will be based more on your rifle shooting ability than any difference between the two.