Which Virtulization is best ??

XEN or KVM ? Anyone explain in brief ?
KVM (Kernel-based Virtual Machine) is an open source hypervisor technology for virtualizing compute infrastructure running on x86 compatible hardware. Also like Xen, KVM has both an active user community and significant enterprise deployments.

A KVM host actually runs on the Linux kernel along with two KVM kernel modules (the kvm.ko module and either kvm-intel.ko or kvm-amd.ko). Through its tight kernel integration — including the I/O connectivity with kernel block and network drivers provided by Virtio — KVM can offer its guests more seamless access to all the complex hardware and networking profiles that they might encounter.
 
Xen tends to be more stable. It is older, is more mature and offers near native drivers for OSs like Microsoft Windows, whereas KVM is weaker in those regards. However, KVM does very well when you compare Linux vs Linux against Xen.
 
Since you are comparing only with Xen, I will recommend you go with KVM. We have used VMware and KVM both. Both are stable and secure, Vmware has a lot more features ofcourse.
 
Xen tends to be more stable. It is older, is more better and offers near native drivers for OS like Windows, whereas KVM is weak in those regards.
 
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