I can only speak for ReactJS since I've not built anything beyond a simple prototype in Vue.
That said, I've been building large scale SPA apps for many years and have been, by far, happiest working with ReactJS.
While I'm a fullstack, multi-platform, polyglot developer, I got my start mostly in backend SOA type of enterprise development. I think that ReactJS really lends itself towards software engineers more than designers and frontend developers.
The patterns used with ReactJS and especially with Flux or Redux scream of design patterns that will frustrate many designer centric frontend developers. So, in that sense, it could be a steep learning curve.
Even if I was too try Vue, I would likely opt for JSX over the HTML template engine because I can't stand declarative programming in HTML to simulate imperative statements and loops.
Also, while the perf tests might show an edge with Vue over ReactJS, it's never been a noticeable issue with our very large applications.