Choose Excalidraw if you're looking for a tool to quickly sketch concepts or brainstorm ideas with a charming, hand-drawn feel. It's perfect for developers working on architecture diagrams or quick visual notes, especially since it's free, open-source, and can function offline. However, if you need polished visuals or a comprehensive design tool, you should look elsewhere.
On the other hand, opt for immich if you're a tech-savvy user seeking to manage your photos and videos with privacy in mind. Its self-hosted nature gives you complete control over your data, but it does require some setup and lacks extensive third-party integrations. If you prefer an easy, cloud-based solution, immich is not the right choice.