The the Tight Cluster map is a bit too lopsided most of the time.
This is very much personal preference, but I did a lot of testing on the maps, and these were my conclusions:
Tiny-Small: Use Random.
Medium to Immense: Loose Clusters looks the best. Abundant Stars.
Excessive-Insane: Spiral. Abundant Stars. At the largest sizes the spiral looks amazing, not so on the smaller maps.
Personal Favorite: Excessive. Spiral. Stars -Abundant, Habitable Planets -Rare, Planets Freq. -Common, Extreme Planets -Abundant
A truly realistic map. That feeling when you find a habitable planet that doesn't turn out to be Toxic...Priceless!
Note: Even when habitable planets are rare, and extreme planets are abundant, the ratio between the two is even.