Both are warm copper alloys with different character. Brass, copper and zinc, is brighter and golden and takes a high polish, which suits modern interior accents. Bronze, copper and tin, is warmer and browner and weathers to a stable patina, which makes it the traditional choice for historic and exterior work. In Tacoma we use bronze heavily for period homes and exterior railings, with polished brass for modern interiors, and we will recommend the right one.