Dyson Sphere Program - I love it because it has the cleaner look of Satisfactory, but in a 3rd person view. I could never get used to Satisfactory's first person view. It just doesn't work well for making a factory. DSP also has you go between multiple solar systems to fetch materials.
Captain of Industry - The only factory builder that feels like it takes place in today's time. Has the unique mechanic that mining for materials actually deforms the terrain, and that excess dirt/stone can be used to expand your island. When I last played, the tutorial was lacking, but this may have been fixed by now. Also, anyone experienced with factory builders probably won't need much tutorial anyways.
One thing I like about both of those that Factorio doesn't have (and I think desperately needs!) is the ability for belts to have more than 2 layers. At the very least, I often found myself wishing I could have longer underground belts in Factorio.