As long as the A320neo and the B737MAX are in development there will be no end to speculations on how they will perform.
Aspire Aviaton has a long article comparing the A320neo and the B737MAX. Although the main conclusion (Quote: "At the end of the day, Aspire Aviation predicts a balanced narrowbody market equally split between the Airbus A320neo and Boeing 737 MAX.") seems right to me, there are a few detail which I would like to clarify or correct:
