Alright I'll bite, as a relatively 'recent' "boardwhore" although the "whore" bit has ...not a lot to do with postcount & probably more to do with pics. lol
First board I ever registered at was PornCity. Good board, good mix of people there ...a very "family" style attitude. One I'm proud to be a part of, however I find it has its moments where its just endless irrelevance. (I'm sure I'm also guilty of having contributed, to be totally honest)
Adult Insider is IMO a great board. Its a fun, open, friendly atmosphere & very welcoming, there's people over there who I've seen "rejected" (so to speak) from PC who become both informative & valued posters at AI. Was an eye opener to be sure. There's a healthy mix of "fun" and "business" over there & it tends to swing back and forth every now & then between leaning towards "more fun" and "more business" ...kind of goes through trends, depending on what's going on with everybody.
GG&J I found very VERY business oriented. Very good as an information resource however I will admit that I did not find myself as comfortable asking questions over there as I would on any of the other boards. Maybe because one question I asked had to do with banner rotation scripts, I specifically said "Anything other than PhpAdsNew" and every single person who responded, said "PhpAdsNew" --it wasn't a very good "question/answer" experience for me & I read it but I don't really post there very often.
GFY -- I'll read it if someone sends me a link that they specifically want me to read. I registered there once a couple years ago & made something like 4 posts. Then I never went back until ...*thinks* I forget why I went back, but I went back over a year later, and the first thing I saw was a video of some girl shooting eels out of her ass. Again there was a very long time before I went back. I forget why I bothered to go back again, but I ended up going back & surfing through some of the threads & reading them & occasionally posting in some of them. Nowadays I only go there if someone sends me a message on icq with a link directly to a thread that they specifically want me to read.
MediumPimpin' -- Its definitely different, it has a very unique (at least in my experience) atmosphere, and an eclectic collection of celebrity nip slips as well as other celebrity photos... webmasters, and gorgeous ladies such as Crissy Moran & Terri Summers. I rarely go there anymore though, for a variety of reasons.
Oprano -- I just had to save the best for last.
I love this board, I love the attitude of the people on it, I would easily say that for all the "fun" that takes place, there is a great deal of information & lessons in it all & I would say I've learned more from my experiences on this board, than on any other. It also moves at a pace that I find is not disruptive to my work, like the other boards tended to be.
There's the boards through my eyes.