Tough call since they’re kind of diametrically opposite each other as RPGs go.
Disco Elysium is an interactive novel. If you treat it as such and delve into it committing to their fail-forward design philosophy and unafraid of picking weird dialogue options it is incredibly rewarding. I have not been moved like I was by DE by any other videogame.
Pirating or buying is a coin flip. I hate that Kurvitz, Rostov and Hindpere were forced out of the company and the IP stolen from them. Still, they were not the only ones in the studio working on the game so buying it still gives some money to some of the creators. I think you can justify either decision morally. And yes, the Final Cut is the version you want.