None of the above. Using my 5D and 40D's I manually select the AF point via the small wheel behind the shutter button. With my MKIII I use both the small wheel and large rear wheel to select points (half press the shutter button for AF lock). For shooting fast action Center AF point is most accurate on most, if not all, non-1-series bodies but it depends on what exactly your focusing on and where its located in the frame. AI servo, for the most part, should be used when focusing on a quicker moving subject and One shot on slow moving or still subjects. Focus and recompose works, but only when in 'one shot' and shooting at more narrow apertures while shooting very slow moving or still subject matter. Read up in your manual for a better understanding.


-Matt