Yeah, I didn’t need anything more than the Docker features, so I didn’t bother with Zima. Like with Yuno, Zima is a whole distro on its own instead of an app that can be easily uninstalled.

Was it issues with installing apps or something else?

I will suggest CasaOS. It installs easily, then essentially has an app store (you can add other store sources too). For me it was a gentle way of getting used to the ideas around Docker and how to work with containers. After a bit, you’ll get to where you can set up containers for apps not in the store. Then you might create a whole stack for your Arrs suite. And then maybe you outgrow it entirely. It’s just an app, unlike Yuno, which is a whole distro if I recall correctly.

For public exposure, I use Cloudflare tunnels. Pretty easy to set up (there is a CasaOS package for cloudflared), though the Cloudflare side can get confusing depending on what you want to do.