My main criteria was that I wanted a fast web browsing experience on an E-ink screen because I read a lot and I hate CLUTTER. That means I hate printing stuff out and I'm always reading off of some LCD phone or monitor which gives me eye strain.
I'm not an expert on Kindles or Ereaders so take my comments w/ a grain of salt. For Kindles, my understanding is that you can only read ebooks and listen to audiobooks. I had a 2nd gen Kindle and it had an unusable web browsing experience. Not sure if the newest Kindles allow you to browse the web but when reading about it seemed liked even if Kindle could browse web it locked you into Amazon's ecosystem.
For my Likebook, it's essentially an Android tablet with an E-ink screen which means I can add any app from the Google Play store. Some apps I've downloaded include but not limited to Google Chrome/Docs/Sheets/Keep/Gmail/Calendar, SpaceDesk, Moon Reader, Amazon Reader, Pocket, Chess, etc. You could add Facebook, Messenger, Instagram etc but I'm not into social media. You could even add YouTube, Netflix, Candy Crush, or Etrade although those all would be subpar apps on an E-ink screen.
As far as how it compares to the other Ereaders, I chose the Likebook because it got good reviews and seemed like the best value. There are other Ereaders by other companies w/ very comparable functionality. The goodereader.com website does a good job of reviewing the different brands/models.