It also depends on what you are aiming for as a photographer,
are you simply someone who see's nothing more then a hobby?
are you looking to go into business?
are you looking to improve your skills tenfold?
at the moment as a photographer I would say that, as a source of knowledge and credible critique to help me improve my understanding, the SWPP's credibility has been heavily compromised and once you've seen the latter of how the place operates (ignoring the input from forum users as that is the benefit) it makes you question whether they are any help at all.
The RPS has the perception among many as "easy street" BUT!!! I have never really gone into much research into it so will leave it for a member to fill you in. One thing I found though, you go on the RPS website and there is a program showing how to set up a panel for judging!
BIPP, I have heard a lot of good things about them, you get assigned a personal mentor who checks up on you and works with you to get the grade, and the courses according to members I have spoken to are not to be sniffed at.
FINALLY!
the MPA
had a bit of a discussion with previous members of the SWPP who have moved to the MPA and my impression was that they are strict, you have to attain to standards, and yes you have to be full time and insured!
As well as a few other standards on the website.
But the one comment about them that stuck in my mind was that after these people had joined they got a phone call from the MPA asking if there was anything they could help them on, business advice, any area of photography they think they needed to improve and they could point them in the right direction. Any Mentoring or Courses as well.
and that to me, is a glowing example of what a society should be about!