One thing I've not seen that much comment on is ease of use and
management (i.e you want to change settings etc). I find KVM very
immature in this regard (particularly when you couple it with the
equally immature libvirt* layer).
If you want your life to be easy, choose vmware or virtualbox.
If you want to be ahead of the game, choose KVM.
If you have old boxes without hardware support (check BIOS) then Xen's
paravirtualisation could be helpful in terms of performance.
Adrian
--
Email: adrian@??? -*- GPG key available on public key servers
Debian GNU/Linux - the maintainable distribution -*-
www.debian.org
