I use both hosted and self hosted sentry. I prefer hosted it's less to manage but self hosted isn't too awful as long as you can budget the resources. If you just want the team sentry plan it's going to be cheaper to use hosted. I would only self host if you had to for legal/compliance reasons. In the many years I've been managing sentry we've only had it truly crap out once and that was an upgrade from 9 to their new date versioning basically the whole hosted method changed and it was just easier to start over from scratch.