I'm considering joining the American Society of Picture Professionals (ASPP) and/or Professional Photographers of America (PPA). At the moment, I don't know much about either association except that PPA seems to have a much larger membership. Is anyone here a member of either or both? Could you please give some info on the strengths and weaknesses of these associations? And, if you belong to both, which one would you recommend the most? Thanks in advance.