Come on gents - I don't think it really matters, does it? I'm not interested in the history of this stuff, I just want to cook (and eat) great meat!
So to sum up, it seems that a PBC may not have as much smoke flavor, due to the fact there is not a true exhaust at the top, and doesn't have as much convection as a WSM or traditional UDS. However, this means that there are less variables, and is more of a set it and forget it type cooker. And it does seem that people still can get a smokey flavor by adding wood chunks to the charcoal basket.
Do I have it right? I still am not sure what I'm going to do! I may have found a good source for 55 gallon drums on Craigslist, and if I bought one of those, along with a Big Poppa kit, it's around the same price as the PBC (not including my time in assembling of course)
I like the fact that the PBC is 30 gallons though. I usually don't cook enough to take advantage of a full 55 gallon drum I think and it seems like a waste of charcoal.