A performance media agency specializes in paid, measurable channels like search, social, and programmatic, focused on efficient, trackable conversions. A full-service digital agency bundles performance media with branding, organic social, SEO, and creative production under one roof. Choosing between them often comes down to whether you need integrated brand-and-performance strategy or a specialized team focused purely on media efficiency. Some businesses use a full-service agency for overarching strategy and a specialist for paid execution. The right fit depends on your internal capabilities and whether you need the agency to own creative as well as media buying.