MVC is used most often for web apps. MVVM came out of WPF/Silverlight and is generally used there.

>What is the difference between them? Should we have a preference? It would be easy to guess MVC, which dates from the 1970s, is out of it, but that might not be accurate. Is one on the rise and one on the wane or is it more complex than that?
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>I am hoping for an intelligent discussion among geeks.
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>Mike