Obsidian looked so much better than Zim that I was compelled to try it, but I'd been using Zim for well over 15 years beforehand. So Occams razor might just be

Obsidian looked so much better than Zim that I was compelled to try it, but I'd been using Zim for well over 15 years beforehand. So Occams razor might just be "I'm more used to it;" though there might be an argument for Obsidian growing too slick too quickly? It's got a LOT going on and looks like its flashier and has more features, perhaps too many for me. Also, if mobile is at all important, you probably want Obsidian.