[iSeika]

If we are talking about cosplay wise then it depends. If you want to do an easy cosplay then go for L. If you want to go for a cosplay that is slightly more difficult then go for Light. In my opinion you should cosplay the character you like more.

Character wise I watched half of the anime and both of the live action movies (never got around to watching "L change the world") and from what I saw from those I honestly liked L more. I dont hate Light I actually liked him at first but after awhile L just grew on me more.