Whether Razor or Server Side React, it's the same thing. Both are compiled and produced on the server and sent to the client. No difference except that react is a much better template engine.
Why is React superior to Razor Templates (or for that matter, Razor pages) for server side templating?
I support the assertion that it’s a good paradigm for creating consumable SSR templates I just don’t see anything that empirically cuts it above Razor other than if you know JSX/JavaScript it’s obviously more natural but I’m assuming that’s taken for account here
If you don't want to dig too deep though, compare how to add a datepicker to a view in both systems. With React it is just another component, with Razor it is a bit more finicky.