There's one advantage to PRIME that Netflix / Hoolie don't offer and that is DOWNLOADS.
If you install the Amazon Instant Video app on your android or apple device, you can download full size HD quality video to it, for watching offline.
This was a great feature while I was traveling in Utah. Head into town to do laundry / eat dinner, and I could download a movie or two for watching back at the campground which did not have cell service.
Of course, your mobile device needs to support video output, either Miracast or HDMI out (my LG G2 phone has an hdmi port.