When the dust settled in the lab after two long months of testing
Microsoft’s Hyper-V and VMware’s ESX in the areas of performance,
compatibility, management and security, it all boiled down to two
issues: experience and religion.

VMware ESX took home our Clear Choice award because in our performance
and qualitative analysis of the hypervisor and the first tier of
management tools offered by each vendors it showed depth and maturity
while Microsoft’s Hyper-V components were both very
Windows-focused and very rough.