I self host a lot of shit, but after almost a year of using Obsidian I finally paid for their sync feature for one reason: iCloud sync to iOS is painfully slow.
I was sometimes waiting 30-45 seconds to jot down a note just waiting on the app to open with iCloud sync as my backend. Now, with Obsidian sync, the app is ready-to-go in seconds.
Now if you're only going to be using on desktop, I would definitely consider a git-repository based sync, but if you're gonna use mobile I'd recommend you at least consider Obsidian Sync
Just an aside, this question reminded me of an interview I watched with a former CIA agent speaking about how when he worked overseas he varied his routine randomly every day. Woke up, left the house at different times, drove different routes to work, etc to avoid being targeted. He had a colleague from a different nation who regularly accused him of being paranoid. Then his colleague got assassinated.