My shooting style causes me to use aperture priority and manual almost exclusively. I prefer very shallow depth of field which comes from wide apertures, so if I trust the meter in the camera I'll set it on aperture priority. Aperture priority is also nice when you are changing settings alot and you don't want to keep taking incedent readings with a handheld meter.
Some situations mess with the camera's meter and you can get bad exposures. Water, snow, large differences in light and dark, are just some examples of what gives the camera's reflected light meter trouble. In these cases, I use an incedent meter and shoot on manual.
Program I feel takes too much control away from me. I don't like the fact that it picks the the aperture and the shutter. You might get a good exposure using program, but your composition might be compromised if you wanted a wide open aperture.
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