Two affordable mainstream brands. Iams is WSAVA-aligned (Mars); Purina ONE is the entry tier of Purina (not the WSAVA-aligned Pro Plan line).
Average score: 44/100. 23 products. WSAVA-aligned. Country: US.
Average score: 57/100. 20 products. Country: US.
On overall score, **Purina ONE** wins by 14 points across the analyzed catalog (44 vs 57). Iams is WSAVA-aligned (feeding trials, on-staff vet nutritionist, owned manufacturing); Purina ONE is not.