If you're focused on managing your personal media—photos and videos—and prioritize privacy, choose immich. It offers high performance and full control through self-hosting, ideal for tech-savvy users who want to keep their data secure. However, if you’re not comfortable with setting up your own server or need a solution that effortlessly integrates with other applications, then immich might not be for you.
On the other hand, if your goal is to create a private knowledge base or enhance personal organization and project management, opt for Obsidian. Its flexibility through plugins and local storage caters well to users who enjoy customizing their experience. Still, if real-time collaboration or cloud features are essential to you, Obsidian may fall short, making it less suitable for those who prefer a more connected, collaborative environment.