I feed native#4 as the base of my diet, small quiet company, nice products. I also trust Nature’s variety, Natures logic, orijen, acana, anamet, and innova. Timberwolf and Ziwipeak have some nice formulas if you can find them. Stella and chewy raw food is nice.
What is safe? any and all of these manufacturers can have an individual, isolated problem- orijen is generally quite good, but there was a flap about fish bones in their six fishes formula some years ago; Blue Buffalo had that vitamin D toxicity problem; anything with corn in it can have isolated aflatoxin problems; and salmonella is a recurrent problem that pops up over and over again in all sorts of pet edibles.
also, do you blame the companies that bought contaminated products from China as having bad quality control? personally I stay away from glutens/rice proteins because I suspect they are all still made in china, plus of course they are cheap substitutes for meat.
I would stay away from anything made by Diamond (already discussed), anything made by Merrick (includes Before Grain); both of these companies have had repeated quality issues over the years.
then there are the concerns about what else is made in china and could be contaminated- vitamins? joint supplements?