Satisfactory Review (gussmed)
Satisfactory is awesome. It shares the title of "best Factory game" with Factorio in my mind. If this is your sort of thing at all, you'll love it. It's very full fleshed at this point, despite being early access.
While both Factorio and Satisfactory are fundamentally about building factories, which is largely about moving resources and intermediate products around, they also have a fair number of significant differences. I can't say one or the other is better - they're different.
The obvious thing is that Satisfactory is 3 dimensional. That's huge. You can pack things pretty densely if you like, since you can always build up. It's really amazing looking, and some players are into building very aesthetic factories with the parts available.
Satisfactory has trains, trucks, and flying drones as well as conveyor belts, and as of update 5, train signalling. The trains are not *quite* as polished as Factorio's, but they're good. Trucks are workable if a bit quirky, and fun to watch.
Satisfactory has a fixed, hand-designed map. Which isn't that limiting, since it's a very large, complex map. There are 4 starting areas, and starting in a new area is different enough that it's almost like playing on a new map. Eventually you end up expanding into some of the same areas, but it's still a different experience.
On advantage of the hand-made map is that exploration is a meaningful experience. There's a lot of interesting areas out there. You can reach anywhere pretty much from the start, because building concrete ramps to reach a tall mesa is always an option. Only poison gas and radiation keeps you out of some zones until you unlock protections against those.
Satisfactory is a lot less stressful than Factorio, because there's no external threat. There's no "tower defense" aspect because the wildlife doesn't attack your factory. Most resource nodes are guarded by a few beasties, but they aren't that hard to defeat, so combat's a minor aspect of the game.
There's an early game when you're frequently foraging for biomass to fuel your power plants, but that ends when you get to coal power. For the most part, Satisfactory is game of "how much can you produce per minute," not "how much do I have," since all resource nodes are infinite. The limit is how much they can supply at a time, not how much they supply ever.
All of this may make it sound like an easier game, but really, there's a lot to do. I've played it through to the "end" - the last currently implemented delivery - 3 times now, and that took me over 1000 hours. The challenge of building a factory producing a variety of goods is more than enough.