Wow, great question. Right to the point.
I'm not sure that you could do much better than Purina, but both feeds are knows for being "quality" feeds. In general, the better the feed, the less waste will be produced. This helps the water quality, and hence the overall fishery as well. I've fed literally TONS of each, and the fish seemed to find both very palatable, and I had evidence, albeit anecdotal, of good water quality for the entire growing season.
