That's a very difficult question to answer without carrying out a proper study.

Languages, libraries and frameworks constantly evolving so it's a moving target too.

I think most people will just recommend the stack they know best unless you have more specific criteria.

Again, I don't think you can go wrong with Rails for web apps as a solo dev.

You get a lot of utility out of the box with Rails and you can also easily remove things you know you won't need.

e.g. Little utilities like Array#to_sentence[1] might not seem important at first but they're real time savers when you're working on your own to get something out the door.

1. https://api.rubyonrails.org/classes/Array.html#method-i-to_s...

If you don't already know a language and its ecosystem, then I'd recommend Rails. It is simply the most mature and batteries-included framework. Ignore the claims that it is dead - if you're a solo developer the specific jobs market doesn't matter.