An iteresting fact about Cartoons.
The more simplified something get's the more iconic it becomes. Because Toon Link is more cartoonish than a realistic looking Link, Toon Link's simple design is more recognizable and distinguishable. This is in the more general sense because those of us who play the games have a different understanding, however the average individual would find Toon Link's design more impressionable.
Scott McCloud talks a lot about this
Of course there is more about it and he goes into depth.