I like 4000k in the evening when ambient is 3000k incandescent, but I dislike 4500k+ at that time
During the day, when my brain is white balanced to sunlight, I like 4500-6000k, and I dislike 3000k as too warm, at that time
but, if I dont compare the beam to anything, my brain white balances to all sorts of otherwise weird yellow, green, and violet tints, in a wide range of color temperatures
as a rule of thumb, I like the CCT of my flashlight to be slightly cooler (up to 1000k cooler) than the ambient white balance in that particular environment at the time of use
I voted 3000k as my most used light, because Im biased to low lumens and close range applications