I decided to do a cost comparison: I pay $21.73 per month ($260/year) for NetFlix three-at-a-time discs by mail. That gets me the BluRay when a movie is available on BluRay. I watch with a high-def projector onto a screen that's 5 1/2 feet wide, so maybe around 6 feet diagonal for a widescreen movie. In 2015 I rented 84 movies. (I'm not using 2016 because I was home more on account of my broken arm and cancelled trips, so watched more movies.) This comes out to around $3.10 per movie. I looked up the cost to rent the most recent 3 movies on my NetFlix queue from Amazon streaming. Dr. Strange is $6, Arrival is $5, and Moana is not even available to stream on Amazon. So-called High-Def streaming is lower resolution than DVD and significantly lower resolution than BluRay, which may not be noticeable watching on a tablet, but is very noticeable on a big screen.
So Amazon streaming charges about double for significantly lower resolution compared to renting discs from NetFlix. Of course, with streaming there's no waiting, and you can watch on your tablet or phone if you want to watch a movie on a tiny screen. I do have Amazon Prime, which offers thousands of movies that nobody would ever want to watch, and about six movies you'd actually want to see.
Conclusion: Streaming is a bad deal.
Note: I used to have NetFlix streaming, before it went all to hell and started re-buffering for about a minute after each 30 seconds of playing. There were a few old TV shows I enjoyed watching, but like Amazon, most of what was offered under the subscription was crap. As an added benefit, now that I no longer stream through the Blu-Ray player, it's disconnected from the internet, and Blu-Ray discs no longer insist on connecting to the movie company's web site, something that always annoyed the hell out of me.