I don't know about Hetzner but with Upcloud and Vultr my single VPS setups have been more reliable than multiregion with redundancy setups with other providers like Fly.

A few weeks ago, I tested deploying Rails apps to Hetzner and Vultr for the first time using Hatchbox to deploy Rails apps onto them. I'm still supporting clients on Heroku, but there are potential new projects in the coming months that I might deploy elsewhere. Render is decent in some cases, but you can get a lot of bang for your buck deploying on Vultr, and Hatchbox makes it easy to do, whether you have one instance or a cluster. Hatchbox also helps with putting multiple apps/domains on a single server, a concept I had to give up long ago on Heroku. I've thought about deploying to DO plenty of times over the years, but there was always Heroku, and if I had to find a new home for Rails 8, I think I'd skip it in favor of a more powerful Vultr server. Hatchbox can provision Postgres for you, but Vultr has managed Postgres which is appealing to me. Or if you're just using Sqlite with Rails 8, that's easy to do with Hatchbox but not on Render since Render has an ephemeral file system.