Simply the serrated edge is ideal for a slicing cut, while the straight edge blade excels at pushing cuts. Whittling is generally a pushing cut and not the proper use for a serrated edge, but the propper application would be in cutting through cordage and straps such as seatbelt.
Serrated edges are marketed towards first responders and their popularity crosses over into everyday use, though they are not universal. I do not own any serrated edged knives