not sure these are comparable. I have never subscribed to netflix (only invested in) and it's my understanding you have access to everything for your subscription fee. I have Amazon Prime and never use the video because it seems like everything I find on Prime Video has a cost to buy or cost to stream and has very few free items.
Not going for Disney Plus. The only disney property I like is ESPN and I don't do ESPN+ as there is not enough of the content I want to make it worth the extra fee to subscribe to it. I also feel like I should be given it free (just like ESPN3) since I have ESPN in my pay tv package so I'm already paying the estimated $10/month for those in my pay tv package.
Netflix has reduced their online content from 10,000+ movies and shows a few years ago to less than 4,000 now as they are focusing on original content and no longer pursuing contracts to carry much in the way of other content.
Prime has nearly 13,000 PRIME movies or series available (free to Prime members.)
Every month between adds and subs Prime is growing at around a 3-1 rate compared to Netflix. There is a lot of low budget stuff on Prime but there is also a lot of underground cult classics and Amazon is also concentrating on adding a lot of movies from the 40s and 50s that have never been remastered in digital until now. It is definitely worth checking out.
Amazon also has a new ad supported section called FreeDive that has completely different movies and series (updated monthly) that are free to watch with ads.