I would choose Symfony. I believe it matches all of the above criteria. And it has: - amazingly simple upgrade paths, backwards compatibility guarantee on min

I would choose Symfony. I believe it matches all of the above criteria. And it has: - amazingly simple upgrade paths, backwards compatibility guarantee on minor and patch releases - regular, non BC breaking, updates and new features - corporate backing - large ecosystem of "bundles", which are Symfony's addon system - cli tool for scaffolding, debugging and more - strong conventions that help keep code structure clean when you are in a team of 2+ members