Slaughter vs. enslavement has a lot to do with your style of play and your faction's situation. If things are going well and you can gradually expand along with your family tree, enslavement works fine. You do have to knock down old temples and build new one and maybe some other entertainment buildings but it should be okay.
But if you need to drive into an enemy's heartland and deliver a killing blow before you're overwhelmed by other adversaries, say the Seleucids vs. the Egyptians et al, you've got to slaughter and move on until the threat is eliminated.
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