Which is best Visualization technology in terms of value for money.

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http://www.linuxquestions.org – With a lot of Virtualization technologies I m bit confused which one to opt for . Following are the few choices in front of me. 1) Virtual Box 2) Oracle VM 3) VMWARE Can any one please tell me the best technology in terms of value for money . (I m currently working on Oracle VM have few questions about it. What is Xen technology (I think OVM using that correct me if i m wrong)? Is it stable?) Being free is it as powerful as Virtual Box and VMWARE? Why should i go for it? Is this forum answers any query related to OVM. (HowTos)