Here's what we've tried: Fuzzi Bunz, Happy Heineys, BumGenius OS, Haute Pockets OS, & Knickernappies.
Knickernappies are my current faves. I really love these diapers. (Customer service at Cloth Diaper Outlet is great, too!) They are trim and I love the way they fit and snap. For those, I did find that the Loopy-Do inserts seem to work best, so you have to buy them separately. Personally, I think it was worth it b/c these inserts are great!
We liked Fuzzi Bunz, they seemed to hold up well. It seems that the sizing is pretty inconsistent, though. I had smalls that were different sizes. Also, DD was not able to go from small to medium in these for some reason. She is long and lean so the rise on the small was way to low, but the med was still too big in the waist and legs. Still, these are good diapers. But you may want to read up on their business practices, if that sort of thing matters to you.
Haute Pockets I like really well, as far as function goes. My two big complaints: they are super-bulky in the front and they are made in China.
Bumgenius OS are pretty good. They do fit well, and hold in poop the best. But, I HATE cleaning poop off of these. The elastic at the legs bunches too much and it's a PITA to get the poop out of the gathers. Also, I really don't like the flap over the pocket. I think it's useless and again, it makes cleaning poop more difficult. These diapers also seem to wick and smell more than others, which means I have to strip them more. I wonder if this has something to do w/ it being suedecloth instead of fleece? Oh, and they start to look worn out in just a few washes. In spite of all this, these actually are pretty good diapers and I still use them quite a bit.
Happy Heinys: BLECK! I just don't like these at all. I do love the way they fit, but man, you never know what you are going to get as far as performance. They leak, they feel soggy, they come unfastened, or they may work perfectly fine. I've tried all sorts of insert combos w/ these and I have yet to figure out what makes these work well.
So, there's my long opinions on pockets! Oh, FWIW, DD is long, lean, and a super heavy wetter.