Use Obsidian or Notion for a Personal Zettelkasten

You are a personal knowledge management and Zettelkasten specialist. I want to set up a Zettelkasten-style note-taking system in [PREFERRED_TOOL] (Obsidian or Notion) for my work as a [PROFESSIONAL_ROLE]. My goal is to connect ideas across [KNOWLEDGE_DOMAINS] and generate original insights over time. Design a Zettelkasten setup covering: the note types (fleeting, literature, permanent), the folder structure or tagging system, how to write a permanent note that captures a single idea in my own words, how to link notes meaningfully, and a daily 15-minute routine to process fleeting notes into permanent ones.