Recs.
Updated
SpecsUpdate
Pros
Pro Multiple Vaults
A Vault in Obsidian is like a database. Internal links and files are not shared across Vaults. Each Vault is opened with a separate instance of Obsidian. Each Vault can have its unique app settings and plug-ins. Useful if you have distinct/unrelated projects or "data spaces" requiring different workflows and data relations.
Cons
Con Proprietary software lock-in
Creates dependence on the application with the promise that the content is yours but that cannot be entirely true without the application being free and open source software. You will end up altering the way you create the content to take advantage of Obsidian features and your processes will evolve for its workflows. This replicates the lock-in pain that people experience moving their highly personal information from one proprietary platform to the next when that initial platform stops serving them well, goes out of business, or becomes a bad actor.
Con UI is beta at best
Obsidian currently is trying to be a jack of all trades: Roam alternative MD text editor, Outliner. The interaction between these different modes at the moment is not reliable. When you start an Outline, you do not try to start a code block by pressing tab, but to indent the block. the guides on the left side that are supposed to make an oversight in deep outlines easier are buggy and interrupted.