Sveltekit uses an intuitive file based routing system, so for side projects at least, you can build out an app/POC very quickly.

Personally, I like Sveltekit's back end server better than Rails (to be fair, I haven't used Rails heavily since v3/v4) and Express. Having said that, I'm not sure Sveltekit's node adapter has been proven to scale yet.

Rails has a lot of nice stuff baked in though. So in terms of the many other moving parts of making an app, such as migrations, db connectivity, I think that's where a lot of time can be added on the Node side, especially if you don't already have a shortlist of go-to libraries for the core functionality you want/need.