This one is fresh on my mind, so I have plenty to ramble on about
I've had the Brigade for a year now and loved it. I was completely happy with it until I took it on a trip to Cozumel last summer. It was a bit of a pain to pack for Cozumel trips and is a bit bulky with lots more material, pockets, weight pouches etc. than I need for my type of diving (Texas & Cozumel) I actually dove with a guy in a BP/W in Cozumel and after looking at how streamlined his setup was I started rethinking my BCD a bit. So I bought a Dive Rite Transpac II on a whim to try out with the ability to take it back if it didn't work out.
The first thing that I noticed is the Dive Rite appears to be made with higher quality materials, especially the wing. The Brigade uses a pack cloth wing I think and the Dive Rite wing materials seem to be higher quality. At first with all the padding, big rec wing, oversized weight pockets, I didn't like the Transpac so much. But I took it home, stripped the padding, weight pockets and extra D-rings. I then added a Dive Rite Travel wing and some small XS Scuba weight pockets and tried it again and really liked it a lot. It's important to note that this is not something I could have done with my Brigade. In this configuration, theTranspac is more comfortable than my Zeagle Brigade on land, but especially morese underwater. Much less material physically on you and I like that feeling.
What I gained with Transpac over Brigade:
More comfortable on land and water
More streamlined/less material on my body
Packs better
Need less weight to sink (around 4lbs less)
Better materials (especially the wing)
More customize-able (I can easily change the config for each dive)
Things I lost:
The Zeagle Rip Cord weight system (never used it)
Pockets (rarely used)
The Yellow Thingies (those are nice

)
For carrying things, I do one of two things. I can either clip it to a D-ring if I want it up front or on a small ring on the soft back pad of the Transpac if I want it out of sight. If I need a pocket, I bought a Zeagle Zena expandable pocket (from ScubaToys) that installs on the Transpac harness in about 5 seconds. But usually I don't need pockets so I don't install it.
I just sold my Zeagle Brigade in the classifieds section. It was a great first BCD in my opinion. Very good grab and go setup, but as I get more experience as a diver I am finding my view on equipment is changing. Even now I am entertaining the idea of a DR Transplate or DSS Single Rig setup. Not so much for functional reasons as with the Brigade to Transpac move, but more just to see what all the BP/W hubbub is about.
If I was buying the Transpac new again right now, I would get the harness, a Travel or Venture wing, and not buy their weight pockets. I would look into either the Dive Rite or OMS clipper pockets or even the XS Scuba weight pockets (NOT the ones that attach with velcro though, I had one fall off on a dive)
For comparison, here is a pic of my Zeagle Brigade and Dive Rite Transpac together:
http://www.elliscountyequine.org/images/100_0472.jpg
If you have anymore questions, feel free to post or PM. Hope this helps.