Is Purina Pro Plan or Hill's Science Diet better for a sensitive stomach?

Both are repeatedly named in specialist dog subreddits as go-to picks for sensitive skin and stomach, and both meet the WSAVA-style guidelines that veterinary-leaning communities care about. The consensus across the reviewers we read is that Pro Plan Salmon & Rice has a slight edge in volume of positive owner reports, while Hill's Science Diet Sensitive Stomach & Skin draws more recommendations from owners whose vets specifically prescribed a switch. Many reviewers tried both before settling.