I have a 4 month GS and I am currently feeding him Natural Balance but it is very expensive and I saw diamond all natural and it didn’t contain any corn so that’s a good thing. Tell me what you think?

I know that a couple years back that they were one of the ones that had a problem with tainted dog food. And now they have a all natural line. I am currently feeding my 2 y/o pit bull that and that seems to be the only food she likes. So I am wanting to know what your opinions are on it? I am feeding her the all natural Lamb and Rice formula.
Ol’Roy is crap!