Meanwhile KVM gets more developers
Another reason to stick with KVM. The amount of developers working on KVM is increasing....
Aside from the :-
- the lack of any license costs (quite a major thing really)
- the flexibility (sorry vmware doesn't come close)
- the ability to take live snapshots, not like VMWARE live snapshots as mentioned here http://bulldogdata.com/2012/08/why-vmware-snapshots-are-both-good-and-really-really-bad/ - real full online disk snapshots (that can be used as a full backup)
i.e : http://www.linux-kvm.com/content/first-look-virtual-machine-online-disk-snapshots-coming-fedora-18
Ovirt 3.2 will be out in the matter of days which is comparable to the vcentre app.