One more consideration...the window seat in the exit row has a cushion that is about 1/2 strength. It can become quite uncomfortable. The reason for this is clearance if the exit were to be used. In any case...considering all factors...the aisle seat in row 15 may just be the best coach seat on the 800's. Full recline, full cushion, normal armrest, and increased legroom.
Do we put too much thought into this...well, I guess not - we just spend WAY too much time in the air!