Kindof lost me here, whats the difference between a pool group and MPH or Zpool? I thought these were "pool groups"
A pool group is a set of pools. They can consist of different algos, or a bunch of pools for one coin (or both)... that part is up to you. Online Services MPH and Zpool is a single pool with multiple algos/coins.
With a pool group, you can setup your own pseudo-online service, and use profit switching based on the Coins tab... which is whattomine's data. Whereas with an Online Service, you will use their data.
For me, I have pool groups with maybe the top 5 coins that I really like to mine. On another pool group I will have a bunch of pools that mine the same coin. Some of the pools I mine to are dodgy, so if they are offline, AM will go to the next one.