Serrated and Plain Edges
Both edge types appear at the same 4.5-inch blade length, so the difference is in upkeep rather than in what the knife will cut.
A serrated edge tears through crust and seared surfaces with the points of the scallops doing the work. It holds usable cutting performance far longer than a plain edge because the points sit below the contact surface and stay off the plate. It cannot be restored with a sharpening steel, and the manufacturer states that sharpeners are not to be used on serrated or scalloped edges. When it dulls, it is done.
A plain edge leaves a cleaner cut face and can be honed on the sharpening steel that ships with several Chicago Cutlery block sets. It needs that attention to keep working.
Chicago Cutlery uses a Taper Grind edge across both types, which the manufacturer describes as ground to a narrower angle for easier re-sharpening.