Neither are better. Why would google check your code and say "right this site uses divs, they must be more relevant for that keyword. Rank them first". It's crazy talk.
A simple search with any popular keyword will yield top ten results with roughly a 50/50 split of div and table designed layouts.
Just use what is best and quickest for you. Divs are becoming a bit of a standard but the fact of the matter is it will make no difference. If your website has accessible good content then who cares if it has been built with divs, tables, flash or even 10 thousand frames.