Give me 2-5-2 over 3-3-3 every time, provided I can have advance seat selection and avoiud that middle seat.

I much prefer 2-5-2 to 3-3-3. I prefer a window seat (why waste that astounding view, plus on overnight coach flights I can sleep propped up against the sidewall), and with 2-5-2 there is only one person to move when I want to get out, not two.

With 3-3-3 there are two seats, the window seats, who have to move two people to get out. With 2-5-2 there is only one such seat, the one right in the middle, in this position, and they have the choice of moving either way. Only if the flight is very full does this middle seat get used (other than by choice), not the case with the side seats in 3-3-3.

If you are a single traveller in a window seat in 3-3-3 and, as so often happens, a couple is seated next to you, you can feel you are imposing on their personal space in some way.