I have tried 90% of the freeze dried powders out there and some are better than others. BRS Reef Chili seems pretty good, and I hear great things from friends about the new Julian Sprung Goniopora food.
I like fresh cultured phyto, Reeds Oyster Feast, as well as rotifers.
BTW- Area51phytoplankton.com is our local club President and has been culturing phyo for years. If anyone express an interest I can likely bring some to the show. I have been using it exclusively in our Reef blend since day one.
It is clean, fresh and has done wonders in my tank.
Larry