[Alpha1BC]

I wouldn't say one is more complete than the other. Together it looks like both of them make a complete kit, but on their own they each do different things.

The ZL1 1LE spec kit replaces all the suspension links and knuckles (basically all of the existing bushings). This will reduce you tire compliance under sustained load. For instance, when cornering hard, the wheel won't move as much from the high side-load at the contact patch (i.e., less change in camber/toe) but since you'll still be on stock springs and stab bars the ride and body roll will still be fairly close to the stock setup.

The 1LE track pack is only the springs, dampers, stab bars, and rear toe links. This will stiffen the ride and body roll of the car, but won't necessarily help control wheel deflection under load because you'll still have most of the softer bushings in the suspension links and knuckles.