Somehow I watch most of the content on Netflix as compared to Hotstar and Prime. Prime's content discovery is rubbish, and if I don't follow Justwatch, can't even tell when their library gets refreshed. Hotstar's stream are just getting better, but the ridiculous UI, lack of subtitles in many of the popular shows (Billions, TBBT -- might be just an issue with WebOS app) and erratic content syncing across devices does not make it attractive (though they have the most *famous* content, thanks to HBO, Star World, Disney etc). Don't follow cricket, so that part of Hotstar is moot for me.
I kinda like many of the Netflix Originals (Kingdom, Triple Frontier, Our Planet, Black Mirror etc). Not every Original is a hit, but for every 2-3 sh*t shows, you are getting 1 pretty awesome show. And I reckon that doesn't come cheap. Add to that a great UI, good amount of 4k and DV streams and content discovery is top notch.
On an average, if I'm watching 10 hours of TV, it's 8 hours of Netflix, 1 1/2 of Prime and 30 mins of Hotstar.