I'd say Light cuz he manage to manipulate and deceived a lot of pepz even though he's just a college student
and he is still in the middle of experimenting the DN's ability.. so I accept.. the loopholes that can be seen in the early eps. of the series.

After all,he's really amazing cuz he manage to survive for a long time even though he has a lot of enemies on the way.Somehow I can relate to Light