You are unlikely to get comments from people who have actually built large scale web applications with all three of those frameworks, so you'll get a lot of opi

You are unlikely to get comments from people who have actually built large scale web applications with all three of those frameworks, so you'll get a lot of opinion and little fact. As a second point, all three of those frameworks are solid choices to build a web application with. Selecting one purely for scalability reasons smells like premature optimization. Unless you know you are going to be hitting truly massive scale, all three frameworks can be plugged into a share-nothing-architecture and made to scale horizontally.