generally i use the radial drill as much as possible even if i have to spend some time setting up just to drill one or two holes as it is so effortless with the auto feed. mag drills we have drifted away from them as they are big, heavy cumbersome items and generally you can do the same job with the radial. air drills we use mainly for reaming and counter sinking but occasionally i use it for drilling holes like in the image below. as it is easier than fighting with a mag and obviously i can't get the radial there to do the job either way pro's and con's for all 3 but the air drill does do a super job if you can use the tail screw to get pressure onto the drill.
regards sam