Native vs dedicated builder
Gutenberg is part of WordPress core; Divi adds a dedicated visual-building system. Native editing can reduce dependency on a separate builder, while Divi can provide a more integrated visual-design experience.
Design control
Divi packages visual page building and theme-template control together. Gutenberg capabilities depend heavily on your theme, block theme, patterns and any additional block plugins.
Portability
Native blocks generally keep you closer to core WordPress content structures. Any dedicated builder can increase redesign work if you later switch ecosystems.
Who should choose which
Choose Gutenberg when native WordPress alignment is a priority. Choose Divi when you prefer its visual workflow, reusable design system and licensing model.