I like L much better, he might have some oddnesses, but they all are cute, and he still is rational, while Light... his ideas are really crazy and I wouldn't say that they are very normal... People just can not be all good, each person has his evil side. He should kill every single person on ear and then maybe there would be peace on earth. Plus, though the base of his thought is good, he wants to be like the king of his new world, which is not one of the nice, unselfish, pure thoughts... Light seriously needs help... therefore he would fit in a mad house more than L. L is just plain odd.. in a damn cute way
(I looove L ^^)