The only _must have_ streaming app I recommend is: Stremio (https://www.stremio.com)
Configure it with real-debrid.com & trakt.tv, then you're good to go. (takes 5 mins tops)
With this you get: Simple UI, Auto Subtitles, Good Quality, No Ads and of course All films/series.
For your all - PCs, Macs, Mobiles, TVs (almost all)