Why is one limited to one only? Assuming that the magic camera fairly will only give me one, than it would depend on the time of day and position of the sun relative to my shooting position. It's noon and the sun's directly overhead, the CPOL isn't going to do diddly-squat; if the sun is lower in the sky and ~90ish degrees to the lens axis, then I'll go CPOL, since I can always hold my hand over the lens as a temporary shade.