Techtarget has a short article that lists the pros and cons of the hardware virtualisation solutions from Microsoft, Citrix and VMware. It’s a quick read and gives decision makers a high level comparison of the big 3 solutions. The author does a good job of staying neutral and gives good advice. Each solution has benefits and advantages that are unique. Find what your real requirements are and then map those to the features. My add-on to that: do lots of research. Don’t take the word of a marketing or sales person.