In theory Incus and LXD by default will be slightly heavier than docker; they run a a lot more bare-metal services (ex. systemd) in container giving them more flexability and a VM like feel, which would 99% of the time be wasted resources in a docker container
They also dont have nearly as much 'out of the box' support as Docker/Podman might, especially for single process containers.
That being said docker used to run on lxc until not too long ago, so there's still many similarities between the 2