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: 68/100. 44 products. WSAVA-aligned. Country: US.
Average score: 76/100. 67 products. Country: US.
On overall score, Purina ONE wins by 7 points across the analyzed catalog (68 vs 76). Iams is WSAVA-aligned (feeding trials, on-staff vet nutritionist, owned manufacturing); Purina ONE is not. Catalog breadth: Purina ONE (67 products) is broader than the smaller line (44).