I haven't used either. Cryengine is notoriously difficult to use. Crytek have also had severe financial difficulties. Amazon have their own team working on t

I haven't used either. Cryengine is notoriously difficult to use. Crytek have also had severe financial difficulties. Amazon have their own team working on the source, I'm not sure how this has worked out but clearly amazon have plenty of resources to throw at it if they choose to.