If your bow is tuned and your shot placement is good the mechanicals will put the game down very quickely. I find a 1 1/4 inch mechanical to be very efficient on whitetail deer. You should use the style that you are the most comfortable with, the one you can shoot the most accurate.

Be for warned that shooting a deer is different than shooting a target. You can't duplicate the elevated heart rate when shooting targets. when a live deer is there your heart rate tends to go up and your routine might be completely different. some call it buck fever. what ever it is, it is one of the main reason's things don't always go as planned. when this happens to some that are really good shots on targets, they just can't believe that they could miss by that much, so they start to blame thier equipmnet for the miss. Ain't the equipment at all. it is the unknown element of the hunt, and not even you know how your going to react to the next deer within bow range.. good luck.