I'm sorry, I don't know the difference. Why, will I eventually want/need one of those? What's the difference between the Vanguard pistol grip head and the ones you mentioned?
Thrs why we all ask questions, because people have had to make the same choices. I'd rather buy the proper setup now rather than later.
Well, pistol grips, in general, will either need a lot of effort to release the clamp (so they actually have some tension on the ball and can hold the camera/lens in place) or won't hold your camera very solidly where you leave it. With a ball or three-way head you'll have a screw-down clamp that you can control the tension on, with not as much effort as a solid pistol grip (like the Manfrotto 32x series) will.