I'm going to have to be the stick in the mud and choose Hao. Logically speaking, it takes 40 seconds to kill someone with the Death Note and in that time, Hao can easilly kill Light. Plus, Hao reincarnates every 500 years so really Light stands no chance.
I love how people think this is an actual battle. It's who's liked the most, not who would win in a fight. I must remember to reword this title next year. 2 years. However long this'll take again. Light wins. One last round.