The human version. Aside from SS, all alien is is a superman with amped stats. God is just pathetic, it's just Thor with a bunch of redundant abilities. And artificial being is the worst of all, Doomsday is the only useful one there.
lets take a deeper look at God Amalgam. You would Thor orion ww and juggy strength. You would have the enchanted hammer plus lasso bracers and shields plus the lasso, super speed and reflexes. Imagine thor blocking every attack with his hammer and those bracers. You have thor's hammer plus orion's mother box. The God force godwave and astroforce.on top of all that you get juggs undeniable durability amped by the shields of aegis. I'd say the God amalgam is pretty tuff. I'll get to the others later.
The Artificial Being has Ultron's Unbreakable frame, Tomorrow Woman's Super Strength, Tk and High level Tp, All of Vision's powers plus most importantly his density altering power. With his ability to make himself tuffer, and Ultron's frame, he could be unhurtable. on top of DD's adapting.
The Alien, The amped speed and not just combat speed but mental processing power. He would be able to competently run cicrcles around anyone on the feild and destroy them with the power cosmic or HV/MV or simply pound them to death with the strength of top heralds and the amapbility of the SS and SM combo. And I'm only talking about a fraction of what they can do combined.
IMO the biggest threat to them would be God. Very strong durability and could in theory counter some onf the alien abilities but has lower stats across the board compared to Alien.
Think the Aliens amal is too great and by a decent margin.