Rails is probably a better fit for your needs. If you're primarily concerned with sending forms to and showing data from a server, React isn't going to give you much.
React is great for Figma, Dropbox Paper, Coda, and Pagedraw: apps that are basically entirely local, and may or may not happen to be syncing with a server in the background.
CRUD is a special case of app, and the modern HTML/CSS/JS browser is pretty well tailored to handle all the needs for the client side of one. Maybe sprinkle in some Turbolinks [1] if you want some fancier page transitions.
It'll take time before someone makes a good CRUD framework on top of React. Until then, Rails is a great CRUD framework, and isn't missing much I'd expect to see React solve.