> San Francisco has many more creatives per capita than Singapore
This is out of scope.
The comparison is about city management. Not creativity.
When you talk about creativity, SF is at the forfront a giant nation of 300M people, 2 orders of magnitude larger population and market size. That naturally support more creativity and innovation.
As for how much the market contribute to your claimed advantage, it's hard to measure. It might be that indeed SF per capita creativity, excluding market impact, is better than SG. I have no reason to doubt that, but I see not proof.
Not mentioning other aspects when you are a central cit in a superpower.