I recently moved Nextcloud and Gitea from Containers on a Debian VM to Alpine LXCs running Alpine’s packages. I’ve never had Nextcloud’s web interface so snappy and my resource usage for both is next to 0. If you’re running Proxmox I’d highly recommend trying out Alpine LXCs if they package your services.
I’ve had relatively good luck with docker in containers but eventually decided to run docker in VMs as I only semi trust most docker apps and like the added security I get from having it in a full VM in full isolation. Some of the workarounds for docker in LXCs are far from security best practices.