It doesn't matter. The only thing that matters is choosing whatever compiler, framework or library you want to use. React is a very safe bet in my opinion, it has entrenched itself into many facets of the industry (both corporate and non-corporate). However, don't underestimate the growing popularity of Vue. I've worked with both React and Vue, and I think React needs to up its game because Vue is growing rapidly, has some great ideas (single file components) and more people are becoming aware of it.

The most dangerous thing that any developer can do is choose to work with only one framework or library. Don't put all of your eggs into one basket.

> The most dangerous thing that any developer can do is choose to work with only one framework or library

100% agree, still I found better results choosing a "main" framework/library to learn and then having a set of alternatives.

https://stateofjs.com/2017/front-end/results will give you an idea of where things are by December 2017. React is taking the lead, but Vue has great potential.

I personally worked with both and have VueDevTools and ReactDevTools extensions installed, and I am impressed by the number of websites React icon turns on compared to Vue. Which would mean is has a huge chance of becoming a standard for the next few years.

Used Mithril (think React but smaller API and much simpler) in my first developer gig and I love it. It's my go to for quick prototyping and development.

In my last gig I used Vue and even though I would much prefer writing my views in hyperscript, using a popular framework has its advantages in terms of tutorials, libraries, established practices etc.

What about JSX? Hyperscript's bracket closing is quite tedious to me.

I'm yet to try JSX with Mithril but I've used it with React. I prefer hyperscript when it comes to Mithril. The bracket closing has grown on me.

JSX works great with Mithril.

Personally I love Vue and the ideas behind it. React has managed to break into the industry with a bang and some (bad) PR with the licensing issues they hit last year and has now become very widely used.

They are the same language but require different ways of thinking which both have their uses.

Elm for maximum joy, if you can. Maybe purescrpt plus library is even better?

Use all three.

I lean more towards vue for personal reasons, but in the technology world you will always run across all flavors. So always be knowledgeable in as many areas as possible.

Think of it as traveling Europe. Would you want to only speak one language?

Vue is rocking my boat right now. Love it!

If you understand ReactJS well enough, those skills are quite transferable to React Native.

If you are inclined towards Elm you might also want to consider GHCJS (via Miso or Reflex):

- Miso: https://haskell-miso.org

- Reflex: http://docs.reflex-frp.org/

Reflex is known to be already in production.