The image should tell you everything:
- Planet A has 640k population on a 12k sized planet at 99% landmass
- Planet B has 82k population on a 19k sized plaet at 99% landmass
- Both planet temperatures are in the green zone for my race (Syntis)
This must be a #bugs
@mel could you look into this, as Syntis prefer larger planets with more landmass for their population size.