The Auto Glass industry typically prefers more serrated blades because they provide a faster cutout, especially when the glass is to be replaced. 

Collision Repairers however, remove a high percentage of undamaged glass for reinstallation and usually like to use their kit for decorative body molding and emblem removal as well; therefore, their kits are supplied with a mixture of serrated and regular blades.  Serrated blades are not suitable for removing body molds, they will damage the paint.