Messerschmitt 109 vs Spitfire what is the better aircraft?

The better aircraft was dependent upon the altitude where the fight took place. The Spitfire was better at low altitude (below 20,000 feet), the Me 109 was better up high. The Messerschmitt had a better fuel injection system and the pilot could put the nose down and dive if he got into trouble. The Spit's engine would stall if the pilot did that. The Spitfire pilot would turn tightly to avoid trouble while the Me 109 pilot would dive to escape. Generally, planes that can turn tightly do not dive well. One plane turns better, the other dives better. The skill of the pilot was the most important factor. The Spitfire evolved into the better plane later in the war.