I think in a battle Light would likely win since he simply needs to write Lelouch's name in his deathnote. Though, if he doesn't know his true name is Lelouch Vi Brittania then obviously it wouldn't work. But, Light could use one of his three followers to make the pact for Shinigami eyes to discover his identity. Though against another genius, I doubt it would be as easy as that (L, anyone?). One thing about Lelouch was his horrible habit of always attending his school, even with all of the ridiculous things that were going on in the world. It's for that reason that I think Light would win. Also the fact that Light would not reveal his ability or identity until it's too late for Lelouch. I certainly think Lelouch is a better person however. I would choose him as my favorite. Everything he did, he did for good, and not for himself. He didn't want to become some god of the new world. What they wanted was similar, but Light got lost and corrupted along the way. Alas is the nature of the deathnote. Anyone who uses it is sure to have a horrible death. That was said at the beginning. They were both quite brilliant, but I think Lelouch comes out on top in the end. Although, Light's sadistic conceited personality has its own certain charm with me. I think they both have their own benefits. But, Light was too selfish. The way he treated Misa really made me not like him as a person. It was horrible how he used people. Though it's true Lelouch used people as well... his were not selfish reasons. I choose Lelouch.