I really prefer the Amazon version of Android on the tablet, for using Amazon services. I watch a lot of my “TeeVee” via Amazon Prime – and Prime offers a pretty stellar feature for tablet users: download the movie. The tablet OS’s integration with this is great. I browse movies, tap download and they are easy to find and play. No messing with “Which VLC today?” or “Plex hates this video for some reason.” Nothing like that.
That is enough to justify keeping a simply rooted version of their OS to the pure Android ROMS.