If you’re going for speed of development, it’s hard to beat server side rendering in Rails. The creator built Rails for speed of development and happy engineers. It’s also very opinionated (convention over configuration) which helps me just build out features rapidly without making thousands of pointless decisions.
I am not opposed to React for like, a calendar application, or a particularly complex part of a web app, but most web apps have 90% CRUD and 10% shiny.
And with well-tuned SQL and turbolinks dropped on, Rails pages load in 30-60ms with no page refresh.