Amazon Prime has a solid video library, even compared to Netflix - or at least, it does in the UK. It's amazing how they're screwing it up on the positioning/awareness front though.
Only a few years ago, I was a convinced LoveFilm customer (Amazon bought LoveFilm in 2011) and only used Netflix on free trials. Oh how times have changed: since rebranding to Instant Video from LoveFilm, their base has dropped even further, and while everyone I speak to has at least heard of Netflix, nearly nobody is aware that their Amazon Prime membership also includes video.
And now with music, they don't even have a good library? Psssh.