Echo JS 0.11.0

That's your personal experience and personal experience depends on person and project. I had more than 3 months to work with pretty big ng1 codebase and I'm still unable to wrap my head around all these "@", ">", "=" and all ng1 cryptic syntax for property-binding.
At the same time I dived into ng2 easily (with prior RxJS and TS experience, though) w/o any guidance. Much easier than e.g. Ember.
Of course, ReactJS was even easier than ng2, but for any big app you'll need redux, redux-thunk, redux-middleware and all other bells and whistles, which makes actually learning ReactJS.
And after several years, saying I program in React will not mean anything, because do you use flux-saga (not a real thing, probably) or redux-thunk? And with Angular2+ there will be only one type.
Ng2 might never reach popularity of React, but it will have its niche in Enterprise world.