Mazuri is one of the better foods out there, yes. However, some chins do not do well on it. My girl, Hash, did fine on Mazuri, as did my boy, Monaco. However, when I got Cuda, he had soft poos, so I switched to a different feed and all seem to be doing well on it.
No food is the "best" food you can give, as all chins react differently to different foods, just like people. Also, different mills of the same product can have different product. There could be a bacteria in the water they use in the plant my Mazuri got milled from that isn't in the plant Sumi's Mazuri gets milled in. There's so many different factors to consider when discussing feed. But Mazuri is a good feed.