These are the two main tools to maintain EMF models. I wasn’t decided which one to use, while I was still developing my project models. As the models became bigger and more complex, I had to start to facilitate a repository which also keeps the versions. I could not find a comparison of EMFStore vs. CDO. CDO features come integrated with Eclipse Modelling, but I was not sure. At some point http://ekkescorner.wordpress.com/category/cdo/ I encounter this selection, and model evolution attribute of EMFStore where CDO lacks. So I started to use EMFStore.