Spitfire vs. ME 109 Battle of Malta?

I was watching a TV program about WWII that compared the ME109 against the Spitfire and they fed both planes characteristics into a computer to compare the two. The computer simulations reached the conculsion was that they were pretty much equal but during the Battle of Britian, but the ME 109's had to fly further to get to battle so they would run out of gas. When I was a kid I lived next door to a RAF Ace from the Battle of Malta. I believe in Malta both planes would have to fly the same distance to engage. My neighbour always said that the Spitfire had a very slight upturn at the wingtip that you can't see in photos and according to him this very small difference in wingtip more than anything else that gave Spitfires the advantage in a dogfight between the two. I noticed in the computer similations the wingtip curve was never mentioned. So I wonder what pilots would think, was my neighbour right, would that really make a difference in a dogfight?