When taking delivery I was faced with the SAME SAME SAME dillema...
Ive heard nothing but good things about duratrac's record in winter conditions and being north of the border... its an important factor. I was todl the duratracs would be a little louder. a little more expensive but would handle better in winter conditions. the K02s have a better sidewall etc. so depending on the type of trailing you do might be a better idea, im guessing youve done your homework so its not new to you...
I went with the duratracs and have 33s.
Now that Ive run them for a couple months, I am more than satisfied. the noise, I couldnt care less and actually like hearing it lol. They perform amazingly well on the trail but then again I havent done some really intense stuff yet (nothing any other jeep wouldnt be able to do). but still had less trouble than a lot of my trail buddies. I havent compared to the K02s though.
Little peice of advice... if youre contemplating going bigger... youll be convinced when you have them on your rig. ive had mine for a couple months and Im kicking myself every day for not having gone straight to 35s. so just do it.
That being said, Duratracs are amazing. and Personally found them to look a little more gressive than the K02s which is what tipped the scale for me.
Having made my decision and gone to 33s duratrac and now wanting 35s. I'm for sure going to get 35s, the question now is if im going to keep the duratracs or sell them. im most likely going to keep them and use in winter and switch to 35s and get some stupid mud tires for summer since thats mostly the type of trails we get here. hope this helps you somewhat!
EDIT: I forgot to mention. I have the 3.73 gearing and have ZERO complaints. I know 33s are nto a HUGE step. and Im planning on keeping that with 35s but at least reinforce thigns a little (run it till it breaks then go to a D40). honestly not worried about the torque. im mostly on the highway and also since its manual, if i need to pass another car, i just downshift? nothing hard there and its rare. At first I was a little scared she would be crazy sluggish but in all honesty, dont worry about it at all. yeah youre going to see a little difference but yours not driving a racecar. its a jeep and its made for offroading.