Jeep 4.0 in 69 Barracuda

I am so going back and forth on this.

Assuming I wanted to buy Wilwood Brakes (which I really don't, but for the sake of the discussion), I can buy the same brake setup for the early spindle as I can for the later spindle. And I looked at other brake manufactures such as SSBC which shows the same options where I can buy the same kit (obvious different part number) for both the earlier spindle as I can for the later spindle.

So if brakes options is not a reason for moving up to the larger ball joint, what is? Why would someone want to move to the 73+ ball joint? Other than the very common single piston brake setup available for the 73+ spindle.