[SCOTI]

Suspension wise, the leaf spring set-up can be tuned to plant your power level (& beyond w/a CalTrac set-up added). They can also ride decent given the right spring rate, bushings, & shock combo.

A 4-bar set-up can also plant your power level (& beyond). Given the nature of the set-up, you'll be using an air-bag or coil-over as the 'spring'. Both of those options tend to provide a better ride quality when set-up correctly (proper spring rate/height).

Realistically, in a lighter 1/2 ton truck, either will work well. A HD truck? I would definitely switch to a 4-bar as the leaf packs required to support the weight capacity they're capable of moving kill the ride quality.