I'm working within the corporate learning context and would argue that it's not so much a matter of open-source or not open-source. It's more a case of fitness for purpose. But then open-source products are easier to make fit for purpose because you can adapt them.
You might find some links from my blog useful. Here's a starting point that picks up all the links I've categorised under "Context, Management & Implementation": http://www.berthelemy-family.org.uk/blogs/index.php?blog=5&cat=29
Comparisons and advocacy
The argument for Moodle and open source in corporate and other non-academic environments
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