These two spfs take different paths to a similar destination. Both formulas include solid hydrating ingredients, and the overall scores reflect that — the gap here is genuinely slim.
Dermalogica Dynamic Skin Recovery SPF 50 brings Saccharomyces Cerevisiae Extract, Citrus Medica Limonum Peel Extract, and Camellia Sinensis Leaf Extract as actives, while murad City Skin Age Defense Broad Spectrum SPF 50 relies on Tocopheryl Acetate, Avena Sativa (Oat) Kernel Extract, and Retinyl Palmitate. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Both sit in the premium bracket, so value comes down to formulation quality. Dermalogica Dynamic Skin Recovery SPF 50 gets the nod here with its 8.5 overall score — you're getting more for a similar outlay.