I have been on upper and lower deck. Upper deck is 1-1 configuration, make it quieter cabin. Lower deck us 1-2-1.

So to me if the same as the lower deck you can imagine as 2 side 1-1 and 1-1. Of course upper deck is all window seat, which useless anyway, as the window is behind you.

If u want quieter deck then go upstair otherwise you won't miss much in my opinion.