Color of stars

I seem to find most of the very high PQ (usually extreme environment) worlds on my maps around violet stars, and I believe that yellow stars tend to have more habitable non-extreme planets. But I don't play a wide variety of map types--huge and immense, mostly with a moderate amount of habitables & extremes--and I don't keep methodical notes.

Violet will always have at least one PQ 18+. Some colors (orange and white, I think - maybe green too) will never have any habitables (barring the Mega Events, of course) - but of course if you can see the star you can highlight it and see how many habitables it has. The violet one is the one to look for.