A:
I have both and tend to watch Netflix more. Netflix seems to have a larger movie selection while Amazon seems to have the newer TV series. One thing I really don't like with Amazon is that they will always try to show you the "pay per view" videos even after selecting "prime video only".
I enjoy Amazon because of the free shipping as I do most of my shopping there. They both have high resolution videos and both services are nice to have. Amazon will have the newer videos and quite a bit of them aren't included with the "prime membership" with rental fees of $5.99 and up.
Our household watches more from Netflix but we do enjoy having both. I think both offer benefits that are quite similar. I enjoy trying out TV series that I may not have watched on regular TV. Neither Netflix nor Amazon have advertisements, unlike Hulu. Hulu has the TV series within a day of original airing but I canceled my Hulu subscription because the advertisements were as bad as watching regular, aired, TV.
I really like both Netflix and Amazon Prime. Don't think you would regret either one.
We use ROKU for our streaming video. Love the Roku. Very simple to install and use. It always works flawlessly.