First and foremost, welcome to the board, TH.
Now let me first start off explaining that I'm not here to diss Professional Muscle or any other board, for that matter, in any way, form, or fashion. But to say that this is the best board is naive. Why?
Well, let's open our eyes and wake up to reality. Granted, Professional Muscle is a kick ass board and, quite frankly, I have nothing bad to say about it. But PM is still fairly new. That means, there are hundreds of boards out here that got a head start years before it ever existed. For example, AB, AR, SBI, AMadness, AMinds, Ster'ology, AnabolicParadise (RIP), just to name a few, have been around at least 5 or more years.
So what constitutes "the best" board? Of course, the active members do. Then there's the Administrators and their Moderators. Most importantly are the board's sponsors because without them, the board can fail horrorably. But above all, some boards have that one special training, supplement, or AAS forum that's solely headed by a professional nutritionalist, bodybuilder or powerlifter for great professional advise. And it's those individual issues that can constitute the success of a good (not always "the best") bodybuilding/powerlifting message board.
And don't get me wrong bros, I'm on at least 40+ message boards, including PM and the ones on my sig, and I'm always seeing a thread which claims that the board is the "best on the internet". Yet, no one can really explain WHY. Why do you feel that it's the best over all others? And YES, I've commented on most of the boards in my sig as being "the best" but I've also explained why. That is because EVERY board is best for one reason or another.