I've inherited a web application that's held together with invalid HTML and riddled with inline CSS. Got the green light to redo it all.
Replacing all the markup has been on hold pending BS3 (the mobile-first aspect of BS3 seems a big win over BS2), but while waiting I've seen a lot of people talking about Zurb Foundation and its "superior" grid system.
From a purely HTML5+CSS3 point of view, what do you think of BS vs. Zurb?