I was using Obsidian for a while, but actually switched when I found an awesome open source alternative, SilverBullet. The best comparison would be "Obsidian but for tinkerers/hackers".
Data is stored plaintext the same as obsidian - I actually just copy pasted my vault and it worked with exception of wikilinks being absolute paths only - and haven't looked back
The only downside is that its in early stages of development, but definitely usable