The company style
Every company which creates web sites has their own style. Probably not design style because that depends just on designers but certainty in coding and making html/css code. Today I was really impressed when our technical director says that tables are better than divs.
I’m certainty not pro and didn’t create any big projects yet but anyway I have big doubts about that. The biggest disadvantage of divs that I know is trouble with vertical-align inside divs in some browsers. There is also a fact that a lot of good web designers (developers) have gone to divs creating. That could be read in their blogs and articles. Soon I’ll have an opportunity to find out what style is better.