'06 Sierra came with Bridgestone H/T "highway" tires. Great mileage, better mud/snow traction than expected. Replaced them with the same tires at about 45K miles. OEMs still had enough tread for inspection and I gave them to someone on here that needed tires, I don't like going into winter with less than a quarter inch tread depth, just me.
'10 Z71 came with Bridgestone A/Ts. Absolutely the worst tires I've ever had. No better traction than the H/Ts, uneven wear. Had alignment checked several times, rotated and proper inflation, still cupped on the front end. Put a set of Cooper AT3s on steel rims for the rest of the time I had that truck. Put the Bridgestones back on when I traded it it. Liked the Coopers.
'14 Silverado came with Goodyear "highway" tires. Good gas mileage, punched a hole in one at about 10K. Replaced them with Hancook ATMS. 40K on them now, still doing fine. Still have a quarter inch of tread depth. Lost about 2 MPG over the OEM Goodyears, don't care.
As for BFG KOs, had a new 2002 S10 ZR2 that came with them. Decent in snow, not worth diddly in mud.
One was replaced free at a couple thousand miles, due to a heavy spot, couldn't be balanced. Shook the truck anytime it went over 75-80 MPH. When it was on the dealer's spin balancer, it broke the balancer loose from the floor, shook it so bad. That drew a crowd in that corner of the shop.
At about 45K miles, the left front tire literally exploded while I was coming home from camp, rolling down Rt. 15 at 75MPH just south of Trout Run. Had to hacksaw the steel belts from around the lower A arm, to get the tire off. Ain't owned a BFG since.
Either Coopers or Hancooks would be my tire of choice?