I have used several Joomdonation extensions, so I have a basis for comparison. First, Edocman is a perfect solution for handling downloadable materials. I used DocMan for years with my joomla 1.5 site and automatically bought the new docman 2.0 when I needed to set up a joomla 3.2 site, I thought that would do. Actually, it did. That extension is all right but I must say Edocman is better. Why?
First, it looks better. For my taste Edocman css looks better.
Second, it is much faster. For example, bulk import 100 documents into both would result 5 seconds for Edocman, 20-30 seconds for DocMan. Both does the job without any problems, both stable but the joomdonation extension is faster.
Third, it offers more options, Edocman is more refined, let's say more accomplished and offers better modules. At the moment DocMan doesn't have a module for the "Most popular document" or "Most downloaded document" but Edocman does. I don't really understand why these modules were not available for Docman, but they informed me that these are on the way. Pity, they aren't available now.
All in all, both extensions are good very good, most importantly they are all rock-solid, runs without problems but for me Edocman suits better.
And one more thing: Tuan is really helpful, gave me a hand when I needed support and fixed the issue which was not an issue but I didn't know how to setup the component well. Thank you Tuan.