I shoot both. Generally I love POC more because of forgiveness and quietness. But good POC arrows are pricey. But aluminum is more stable and stays straight.
I have 2 sets of POC right now, a 40-45lb set and 45-50lbs set, and I forgot about a 80lb set. I generally use these for my selfbows. Seems fitting.
I have litterly 4 dozen alum, of various types. I generally use these with my fiberglass bows.