I would definitely say the sims 4 with this one, aliens in the sims 2 were just normal sims with different coloured skin tones and weird eyes, the alien abduction were too regular aswell, the sims 3 aliens were more like an NPC character the only way you could play as an alien if you were abducted by aliens and had a baby, they do have unique abilities, the sims 4 aliens you can create them in CAS even give them a human disguise, they also have unique abilities, they can have children with each other or other sims, alien abductions are rare that you get a surprise when it happens and also male pregnancy can happen like the others