They're both great games, but they play very differently. The scale of DSP is vast-- you're a giant robot that can fly to different planets, and you end up setting up supply chains that span entire solar systems-- and in late game, you can even go to OTHER STAR SYSTEMS if you need something exceptionally rare in greater quantities.
Satisfactory is so first-person that it can seem daunting, and unlike DSP you have the very real chance of dying. And, for some reason, in a spacefaring society you have to reinvent the gun. >_> That said it is much more intimate, and the struggles are much more rewarding. Getting that new node producing can feel much more satisfying (no pun intended) when you remember all the fauna you had to fight through to get to it, the pathing you had to do to connect up all the power cables and belts...
So, for me, I'd say it depends on how you feel about that sense of scale! If you want to feel big and powerful, give DSP a try. If you want more of a challenge and prefer a smaller-scale experience, try Satisfactory. Oh, also, Satisfactory has multiplayer available, so if you ever want to try and get more friends involved, that's the obvious choice!