Thanks for the info.
I'm torn between the Nitto or the KO2 now.
I've had 275/55R20 KO2s on my 2017 ATB for roughly 2,500 miles now. Here's a mini review as a data point for you:
Road noise: louder than the stock tires on the 21" rims, but you stop noticing it quickly.
Road feel/handling: they're definitely a bit softer and you notice more "squishing" during higher speed turns
Wet conditions: they're a little squirrelly around tight turns when it first rains and oil/debris is on the road surface, but after that it's fine
Snow/ice: we had blizzard-conditions in the mountains this past weekend (roads were a nightmare), so I got to test this extensively. The KO2s were fantastic in deeper snow (1-2 feet) and had no problems getting traction. The trail of cars in front of me went through a steeper uphill curved section of road that was visibly icy with CalTrans + Highway Patrol waving cars through one at a time. Every car in front of me, trucks with 4WD + A/T / sedans with AWD and all-seasons / vehicles with chains, slipped side to side and struggled for traction through that area. I was pleasantly surprised to experience almost zero slippage and no side-to-side movement.
Off-road: when I had the KO2s on my 2016 (~10k miles), I took them off-roading several times and even without airing down the off-road traction was great. No issues getting on/over obstacles including very loose gravel, chunky rocks, and smooth polished slabs.