Looks like you've got it all sewn up neatly, Cobber. So, what are you trying to prove by establishing this thread if you already know the answer? Thankfully (heaven help us...) the RAAF didn't have to bother with such box ticking when it had to go to war because both options were available to it. It chose the Spitfire for short range defence and the P-40 for long range fighter bomber duties and if I were in the same situation I would also make the same choices. Why bother trying to justify which was better when the answer is clear. Read your history books and learn about both types' use in the PTO by the RAAF.