> choose one for an upcoming CMS project.

Thing is, none are CMS's. If that's what you need, why would you start with a framework? Sure it's fun to build and I always think I can do better than the existing CMS's do, but it's never a good use of my time - or good for the client.

Please, if you need a CMS, use a CMS. If you need a Content Management Framework (CMF) one of the above could save time. If it's an application surrounded by managed content, your choices are different again. But please don't reinvent the wheel if you can avoid it.