What's the best software learning service that improves your development skills and understanding of various new technology?

I'm interested in asking my company to get a corporate account to a service like Lynda, Pluralsight or Egghead.io. What would be your recommendation of these three? Why? Do you have any other recommendations to checkout? Bonus: any free services that offer a range material on new tech.

There's a TON of information out there, they aren't always high quality, it would be awesome if we had access to quality content to practice time permitting. While I know there still is a plethora of quality free content, it does take some time to find if you're not quite sure what you're looking for. It's just the early stages of an idea, but I'd like to approach my team with a thoroughly thought out plan. Any feedback welcomed!

Edit: Some of the tech we use Redux, Relay Modern (and classic but moving away from it), React, React-Redux, GraphQL, Flow, Jest. I'm all up for learn stuff outside of this for personal curiosity but would want something that focuses on these.