What's the best error reporting tool for JavaScript applications?

Im currently looking into various error reporting tools for my companies JS applications (Node/Koa/React and Node/Express/Backbone) . We use airbrake for our Ruby applications however im unpleased with the work its doing for our Js applications.

Would love to hear your thoughts on the various products and reasons as to why one is better then the other.

Here are some products that im currently looking into:

Sentry - https://sentry.io/welcome/

Rollbar - https://rollbar.com/vs/?v=a

Track.js = https://trackjs.com/

Errorception - https://errorception.com/

Bugsnag - https://www.bugsnag.com/

Atatus - https://www.atatus.com/