If you do Photography
solely on the MBP, I would say get anti-glare... just so you don't have to come on here and have everyone tell you that you should have went with anti-glare if you are not happy with the color. However, if you do it on the side, I say whichever way you go isn't going to hurt you. The glossy screen will give you richer, deeper colors. Some people say they can't cope with reflections, etc. But when you have reflections in bright lit rooms, simply turn up the brightness and the reflections go away. I'm using this in a very bright room with lighting behind me, and my LCD brightness is adjusted to drown out the reflections, and not blind me at the same time.
Bryan