I've rolled Earth+ sized planets with populations in the billions that had huge sprawling ruined megacities. Generally, going for the billions on a habitable planet class is a good bet.
Outstanding. How do I go about "going for the billions?" I don't know what parameters to start with (other than excluding cerberus, etc.) And I presume that at each stage of the generation process, there are some better and worse options?
I get that the last step can have a huge range (presumably based on the colonization sim), but I imagine that the max pop is capped by the planet attributes themselves. Do we know what the goldilocks characteristics are? I have aimed toward earth-like, but maybe paradise is better? for instance, slightly lower g? Maybe less axial tilt? A bit drier than home? Is alien life helpful?
Thanks again for the insights.
Going for large Siwa-classes is always a good bet, but in general as long as the climate isn't too terrible, dice gods are the main arbiter. Even less 'perfect' worlds I've played can have hundreds of mil. or billion people if it turns into a major mining colony, manufacturing center, etc.