Amazon has one huge problem for me: Language. I'm in Germany. I do not want dubbed movies/shows. I need English subtitles (translated subs are useless but I need subs to understand what's being said during loud scenes). Amazon usually (less than Netflix though) has OV, but subs are almost exclusively in German.

Netflix, on the other hand, has almost everything in English with English subs (exceptions are foreign language shows and most anime)

Of course, it doesn't help Amazon that their interface is atrocious and that they have ads. (Well, I mean Netflix is working towards making their interface worse, but for now, they are still miles ahead)

If I wouldn't get Prime Video for free with my normal prime subscription for shipping, I'd never use it. I barely ever use it as is.