My money is on Boeing, they have got their decisions concerning Airbus right so far, they said the A380 would be a commercial failure and so far it is, not even close to break-even. Boeing saw this and offered them a consortium to spread the cost and increase the likely market, Airbus said 'No', Boeing pulled out of the race.
From a passenger comfort point of view the B737 has the A320 beaten into a cocked hat, from the passenger seats the A320 sounds like a farm tractor on Speed, a deafening racket.