What gauge nail gun do I need for trim and finish work?

Across the reviewers we read, the general consensus is that 18-gauge brad nailers handle delicate trim, shoe molding and small cabinetry with the least visible holes, while 15- and 16-gauge finish nailers are preferred for heavier baseboard, crown and door casing because they sink longer, thicker nails with more holding power. Many trim carpenters keep both on hand.