I can’t believe that anyone would ever use ‘the best’ in the same sentence as Lords Empire but to each to his own. Release the Witch has some decent world building. You can also read some CK2 style quests which are like country/organisation management on space battles and sufficient velocity forums.
I can't say this is the best because each one has it's downsides, but for me.... Everyone Else is a Returnee Martial World Stellar Transformation Edit: oh sorry kingdom building lol, Release that Witch