Why a 9" over a 12 bolt?

[1969Crossram]

Why does everyone seem to want to buy a new 9" for their GM cars when you can purchase a new 12 bolt? Unless you are looking to change gearsets in a hurry, a 12 bolt will hold up fine for what the majority of people will be using their Pro-touring cars for. Do people feel the 12 bolt will not hold up or do they actually like the appearence of a 9" under their GM car. I AM NOT KNOCKING FORD IN ANY WAY SHAPE OR FORM!! I want to make that clear, I like all American muscle cars wether they are GM ,FORD or CHRYSLER. I would like to hear what people think. Most peolple I know choose to stay with a 12 bolt in their GM car. When I look at all these awsome cars I notice a lot of people choose a 9" and always wonder why. Thanks