Hey, Amazon Prime isn't anything to do with video streaming as far as I know but Amazon own LoveFilm. In terms of which one is best the general feeling is that Netflix is better to catch up on TV series and such and LoveFilm has a better collection of films to watch, so it just depends what you prefer. I think on the high end films LoveFilm has better image quality but no doubt Netflix will catch up in time.
Amazon prime is better. It offers more content than Netflix and you can usually get the latest episodes as they're released rather than wait for them to come out once the season is over.
Sorry I thought you meant the amazon prime delivery service. I've only just seen this Prime Instant Video.
Netflix is my go to, but Amazon Prime Instant video is stepping it up lately. They have some TV shows that Netflix doesnt have. I think Amazon is trying to make a bigger name in the instant video media streaming world. At the end of the day, almost all video streaming companies end up offering the same movies, they all seem to license their movies to all instant video streamers at the same time. Amazon Instant Video usually will charge more for certain or newer movies, whereas Netflix you dont pay extra, but most newer movies may never make it on to Netflix