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Literally the only reason to get these games is if you want to transfer the new electric event Pokemon, the new Necrozma formes and the new UBs to the Switch games next year. And tutor moves maybe.
Most of the story is almost identical to SM, if you care about the Necrozma plotline and the RR stuff i would reccommend you just watch it on youtube, its not like the gameplay is fun or anything imo.
I wanted to pirate UM and buy US, because i did the same with SM, but now that i am played UM i really dont wanna spent 40 bucks for this crap. Gamefreak doesnt deserve the money and i honestly have absolutely no motivation to replay this story for a fourth time.