I have KO2's in 265/75R16. Next tire size will be 285/75R16. These two tires are my top 2 picks when I move to the 33's.
I have approximately 20k-25k miles on my KO2's. I haven't measured the tread depth, but there's still a ton of life let in them. My impressions are that it's been really awesome offload. I mostly wheel in the Sonoran desert terrain, so lots of dirt, rocks and sand. But I don't go out of my way to "rock crawl" so I know I'm not pushing them. In those conditions they have performed extremely well for me. The KO2's have only rarely seen mud, and that usually just means driving through a muddy puddle on a trail. I did get into some slippery mud not too long ago at the dump, and pulling a +1k lb. trailer, and had zero issues with grip. That was pleasantly surprising.
Additionally, I have honestly been disappointed with the wet on-road performance. It doesn't rain much in Arizona, but being an Oregon native I'm not scared of driving in the rain. It's far too easy to spin the rear tires and get it fish-tailey when the road is wet. Fun for some, but the family doesn't enjoy that at all.
At some point within the last six months the tires got a lot louder. Much more noticeable than when I first put them on, but still not too bad. I mean, it's a 90s SUV with AT tires, so road noise is going to happen. I don't mind it, but some may.
All of that said, my buddy put the Falkens on his GX470. He loves them. He's trying to persuade me to go to the Falkens when I upgrade. He's wheeled with me, and has never gotten stuck or had any issues... on a bone stock open diff GX470.
I would lean towards the KO2's when it's time to move to 33's as I like the BFG reputation for quality and they're a known factor for me at this point. However, the Falkens are definitely cheaper. So it's going to come down to cost most likely and if I can find a great deal on the KO2's.
My experience is not scientific and is only anecdotal.