which is better rear static drop?

[Ontcalimo]

I am building a truck which the 6 inch rear static drop that has a four inch spring and two inch block. It has been C notched. My brother said that is not a good set up. He said a six inch spring, is better, as it gives a softer ride. Is that true? What are the advantages and disadvantages of having a six inch spring, like the ones Hotchkis makes, over my set up?