That's all a big debate. Minus pan hard bar if you have a 4 link that mounts to 4 seperate locations, then you will have better caster through the travel, but will have pinion angle problems.
My rustys has 4 arms plus pan-hard bar, but the uppers and lowers mount to the same bolt on each side, so it is a radius arm. If the uppers where mounted higher than the lowers, like stock, then it would be a true 4 link, but mine isn't. I'm converting mine to be a triangulated 4 link, but the arms are going to mount in the same location so it will still be a radius arm, and keep my pinion angle correct, but I won't need a panhard bar.
To each their own but for any type of use, I would prefer the radius setup, simply for the pinion angle. If your axle is sweeping 10-12 inches on bumps, constantly, I would want it to follow the driveshaft, especially at high speeds.
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