The Silverado ZR2 is better than the high country trim in the following ways. It gives out 420 hp/ 460 lb-ft of torque more power than the High County’s 355 hp/ 383 lb-ft of torque. It’s also more off-road capable than the High Country trim.
However, the high trim wins over the ZR2 with better fuel economy hence more cruising range and more towing cap