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I'm very much biased towards Podman, but from what I understand rootless Docker is a bit of an afterthought, while Podman has been developed from the ground up with rootless in mind. That should be reason enough.
The very few things Docker can do that Podman struggles a bit with are stuff that usually involves mounting the Docker socket in the container or other stupid things. Since you care about security, you wouldn't do that anyway. Not to mention there's also rootful Podman, when you need that level of access.
I'd recommend an RPM-based distro with Podman, the few times I've tried Podman on a deb distro, there's always been something wonky. It's been a while, though.
Does Podman work well when you have multiple rootless containers that you want to communicate securely in a least-privilege configuration (each container only has access to what it needs)? That is the one thing I couldn't figure out how to do well with Podman.
Do you mean networking between them? There's two ways of networking between containers. One of them is to create a custom network for a set of containers that you want to connect between each other. Then you can access other containers in that network using their name and port number like so
Note: DNS is disabled in the default network by default so you can't access other containers by their name if using it. You need to create a new network for it to work.
Another way is to group them together with a pod. Then you can access other services in that same pod using localhost like so
Personally in my current setup I'm using both pods and seperate networks for each of them. The reason is I use traefik and I don't want all of my containers in a single network along with traefik. So I just made a seperate network for each of my pods and give traefik access to that network. As an example here's my komga setup:
I have komga and komf running in a single pod with a network called komga assigned to the pod. So now I can communicate between komga and komf using localhost. I also added traefik to the komga network so that I can reverse proxy my komga instance.