I had the Brigade first and liked it a lot. It wasn't until I started traveling with it that I started looking for something smaller. It was a bit bulky to pack. I looked at the Stiletto and it is smaller, but not really much smaller. Also, I don't really like cumberbunds that much.
So I bought a Dive Rite Transpac and started messing with it. At first it was too bulky for me as well, but I started playing around the configuration a bit until I found a setup I was happy with which consists of removing all the padding and going to the Travel wing. The first thing I noticed was I needed about 4lbs less weight to dive this setup that the Brigade which I liked.
Also I played with a few different weight pocket systems. First I had the Dive Rite 32lb weight system, but it was really overkill for the types of warm water diving I do. I'm a big guy so I need between 2-18lbs of weight depending on exposure suit and salinity of the water. Based on that I looked for weight systems that held that much.
The DiveRIte 16lb weight pockets were a little light and also really expensive for what you get. I tried using some really inexpensive XS Scuba 5lb velcro pockets for a while and they worked, but I was not really happy with the setup. I thought about switching to either Dive Rite or OMS clipper pockets to replace them, but stumbled upon another idea. I stole the rear weight pockets off my daughter's Brigade
They have a zipper top, quick release velcro bottom and hold 10lbs each. This was perfect for my up to 18lbs need. I am using this setup now and really like the convenience of it. Plus the Zeagle pockets are about half the price of the Dive Rite 16 or 32lb pockets as well. I think Zeagle makes a pocket specifically for backplates that would probably work better, but I had these in the house, so I went ahead and used them.
Things I felt like I gained with the Transpac is a bit of quality and modularity. I think the DR BCDs are made a little better than the Zeagles. That's an just an opinion though, but the I think the modularity is a lot better with the Transpac as you can literally make it as much or as little as you want. While the Zeagles can do that to a point, the Transpac is better at it, imo. The big thing is I really like the fact I can customize the Transpac to me. Build it exactly as I like it and change that config on the fly for the needs of the dive. Add a pocket, add a D-ring, remove a pocket, etc. Just whatever I need for the dive. I enjoy only taking the config that I need into the water with me.
The things I miss about my Zeagle Brigade at this point... probably just the yellow weight pouches that go in the weight pockets. Those were nice for staging all you weight and easily taking it in and out of your BCD. Other than that, I really prefer the Transpac to my old Zeagle.
The BP/W (Back Plate & Wing) setup is another option. I tried this and didn't like the loss of comfort and adjustability in the harness nor did I like the inherent weight of the stainless steel back plate. I like for my BCD to be light, then add the weight at the dive site. Plus I wasn't big on the hard plate against my back. If I went tech, I would get one for sure, but for warm water rec diving I prefer the Transpac.
The Transpac is a bit expensive though. The Brigade with the Scubaboard discount is like $360. That's a pretty smoking deal on a really good BCD and hard to beat. I like the differences about the Transpac enough to pay the extra money for it. Modularity costs more in the scuba world I guess.
About the size and packability my Transpac is almost as small as a BP/W for packing. For comparison, here is a picture of my daughter's small Zeagle Brigade hanging next to my
2XL DiveRite Transpac:
http://elliscountyequine.org/images/100_0491.jpg
Sorry to ramble on, its just a topic fresh on my mind. Hope this helps.