I'm not sure there is a "best" really. There are lots of quality products out there. I think it comes down to personal preference and what works for your individual dog(s).
I have had good luck with Pro Plan. Others can say the same about Eukanuba, Native, etc.
As a bonus, they sell Pro Plan at the base commissary, so I get it a bit cheaper than say PetSmart or Petco. That's a nice plus.
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