Satisfactory

Another player of both chiming in here.

On combat, let's be real. Neither game has great combat. Factorio enemies mostly become tedious to deal with once they've blanketed the map. The enemies in the later biomes in satisfactory feel more intimidating and they don't get in the way often enough to overstay their welcome. So I probably give the edge to satisfactory there.

I'm going to disagree on scale personally. Especially once factorio trains get involved. I also feel it's more satisfying to watch the birds eye view of all the stuff moving around the factory (plus you typically deal with as many items per second in factorio as you do in satisfactory per minute). Some of the vistas in satisfactory are great, though.

Hard agree with the above poster on the tediousness of running stacked belts in satisfactory too.

And besides all that, I'll also throw a point to satisfactory for using intermediate products to unlock progression tiers. That smooths out progression a bit better. You get to unlock something with almost every new product you set up production for. While science packs in factorio take a lot more bulk work to open up lots of unlocks. On the other hand, factorio has some pretty great unlocks that really make you reconsider your approach to building out your factory and redesigning old parts. It does do that aspect of progression better.