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LXD provides "system containers" in contrast to the "application containers" from Docker.

You create a "system container" and it keeps running as a stock Linux distribution (many flavors are supported). It takes about a couple of seconds to create a new container, and a bit less to remove it.

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LXC is capable of both[0], but Docker wasn't for a long time -- but it got the marketshare IMO because of how approachable it was and the community effort..

[0]: https://linuxcontainers.org/lxc/introduction/

Note that LXC handles application containers perfectly fine now, and it does so in a pretty simple way. Read up on the lxc-oci template and the lxc-execute command if you would like to play around with it!

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