To be fair here, Light would be smarter.
Omniscients know everything so it's kind of unfair, you can't really call that smart.
Just saying that because Light has to work to get knowledge, unlike Omniscients who can choose to know anything or forget anything, no skill involved you know what I'm saying?
Now, if you would ask who knows more the answer is obviously omniscients.
i understand. i get you...but the point is, light cannot possibly outsmart an omniscient. in fictions btw, the omniscients have predicted everything for the upcoming thousands and millions of years, and had vast knowledge and every living being, there have been instances where omniscients have been outsmarted but never much really. and those who did outsmart them were not human and mortal deities either way.
People have outsmarted omniscients?
Only way I see that happening is said omniscient person/diety/whatever not using their powers properly, because I don't see them getting outsmarted at all.