Use a weight belt. It's a rubber free diving style, I like the way it fits.
I also dive a BP/W. I could use integrated weight style pockets on the waist belt, but I prefer the rubber belt.
My wife has Dive Rite weight pockets on her single rig and prefers them to using a weight belt, so it's just personal preference.
What I didn't like about integrated weight pockets when I had them (Mares Icon, and Scuba Pro Knight hawk) was that when I only need 3 or 4 lbs. in each pocket, the weights would shift around inside of the weight holder. If I remember correctly, the weight pockets would hold 16 lbs. apiece.
The take up a lot of space on your waist, especially since (in my case) they were only holding a 3 lb. brick each.
* When I needed more weight, I would lay 3 ea. 2 lb. bricks side-by-side and zip tie them together. This way they formed a 6 lb. rectangular brick that would fill the pocket better and minimize shifting around.
-Mitch