A finish nailer and a brad nailer are both used for installing door trim, but they differ in several ways.
A finish nailer uses thicker and longer nails, typically between 15 and 16 gauge, making it suitable for larger, heavier trim pieces. In contrast, a brad nailer uses thinner and shorter nails, usually 18 gauge or smaller, making it ideal for smaller and more delicate trim pieces.
Additionally, finish nailers have a larger magazine capacity and greater driving power, enabling them to handle more demanding tasks like attaching baseboards, crown molding, and casings. On the other hand, brad nailers are more suited for precision work that requires a lighter touch like door casing and shoe molding.
Ultimately, the choice between a finish nailer and a brad nailer depends on the specific requirements of the job at hand.