Galactic Civilizations IV or Galactic civilizations III Ultimate

Hello, I bought GalCivs 3 some time ago and it came with an expansion. I played it for a while but got bored becuase it didn't seem like it had all that much meat to it compared to Civ 6 and any additional complexity that was there was mostly just a more convoluted UI and pointless micro managing.

https://showbox.tools/

I am thinking fo giving GalCivs another try but with the current Steam Lunar New Year sale GalCiv 4 and GalCiv 3 Ultimate is about the same price.

 

Which should I go with?

 

I am also considering Humankind alternatively