Having worked with both technologies... ( and a few others including Freebsd jails, xen vms and zones on Solaris) Docker is a distinct improvement on a couple

Having worked with both technologies... ( and a few others including Freebsd jails, xen vms and zones on Solaris) Docker is a distinct improvement on a couple of levels. Quicker to launch if your imageset is local. More tractable command set. Relatively bandwidth efficient.