Satisfactory is interesting in its own way. It'd be easy to initially think that its the better/easier game to get into for someone who hasn't played a game like this before, but I'd argue the opposite. The three-dimensionality introduces logistical insanity that is startlingly difficult to wrangle, and the first person viewpoint makes planning the factory floor very difficult. The terrain is also a constant challenge, whereas the terrain in Factorio is generally pretty easy to work around.

But, the world design is totally incredible; it begs you to explore every nook and cranny, and its non-random, so you can link up with friends and share secrets you've found. There's far more super-fun goodies to unlock, like the hypertubes or bounce pads.

Its just different, and I think someone who enjoys one would enjoy both. I tend to tell people to start with Factorio, though; its simple, yet infinitely deep. After about 50 hours in there, you'll gain a new respect for some of the simplified mechanics and fun-factor of Satisfactory; 50 hours there, and you'll gain a deeper respect for the nefarious complexity of Factorio. They complement each other perfectly.