There are a bunch of different WORKERBEE pools and the one I delegated mine to is Hive account@ph1102's pool. All BEE produced there is split to equally to people's delegation share of the pool. Every week, the BEE is paid out and there is some extra bonus tokens as well.

As for which pool is better, I do not know but I like the current rewards I am getting from my current delegation. The problem with having low amounts of WORKERBEE is that your luck in a lottery is fairly low.