It seems like most people on here prefer Eibachs. I imagine both would be a fine choice and serve me well, but would either one be more resilient to added back seat weight? Reason I ask is Im thinking about adding a fiberglass sub box to the hatch and Im sure adding an extra 50-75 lbs to the rear of the car will make a difference compressing the rear springs to a certain degree.

 

That's not even the weight of one tank of gas. Don't sweat it.