cloning a VM or using qcow2 snapshot

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http://forums.fedoraforum.org – I'm using virsh on F19 to manage a VM. I'd like to make a 2nd VM based on it. Should I do this with virsh vol-clone command, or qemu-img snapshot? I think I want to create two external snapshots of the current qcow2.img. The original file is used as a read-only backing file for both VMs, with one snapshot as the delta file for VM1, and the other snapshot as the delta file for VM2. Is that correct? (HowTos)