I have switched to incus and it's really great. It's lightweight, has a working terraform provider, easy-to-use cli, pre-built images (LXC and VM) of major distros (while in proxmox, you have to create templates all the time for VMs), runs on any distro (on proxmox, you're stuck with debian), clustering is nice, supports bunch of storage drivers (dir, btrfs, ceph, zfs), simple web UI and active community. The project leader is also very active and helpful while in proxmox, it's a little unresponsive. You can even install `incus-base` package which only contains LXC specific components for only running LXC containers.

I have noticed incus has better security configs by default. For instance, all pre-built images come with secureboot enabled and there are ACLs which are easy to configure for fine-grained network rules. The only downside I feel like is lack of something like PBS