And then sometimes it doesn't matter what you choose beforehand... I just flew ORD-ICN last week. I had reserved seat 2k, as I was using United miles, and that was one of two seats I could choose from online. I checked it many times over the last few months with the plane swap and all. However, at check in, despite my babysitting, they moved me to 1A. That was fine with me, so I didn't say anything, but when we boarded, someone else was in 2K, my old seat. Weird. Did she get priority of that seat or something?
However, the only other person in that cabin of 8 seats was in 1K. I definitely prefered the seat way over by myself. They slept the whole way, and I was awake 95% of the time. Made up partially for the loss of the suite. Very secluded feeling.