Plataformas de trabajo colaborativo en la Uni 2 (Reference managment tool)

Today working on which will be the best reference managment tool to work with in a group and/or for individual research purposes. I have found some data (thanks to bibliovirtual.wordpress.com). Here you have the chart designed by Dean Giustini more than one year ago, but still useful:

RefWorks Mendeley Zotero

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I think I might try Mendeley for collaborative work and keep on with RefWorks for my personal research. Still doubting...

But here is an interesting opinion: http://bavatuesdays.com/refworks-vs-zotero/