What is better and what is more expensive?
Netflix. It's better and more expensive.
If it's all about series, then Netflix.
Find Netflix better. The Netflix originals are great, there's something for everyone and you don't have to pay or rent films & series extra.
It depends on whether you prefer to watch series or films. I favor Netflix
As for the price, it also depends. At Netflix you can watch everything they have with one subscription - the price differs in the number of devices and the quality
At Amazon you have to buy some films extra because they are not included and for some content you have to subscribe to extra channels - it just depends on what you want to see
Netflix is worlds better than Amazon