Use a functional trainer instead of a cable machine when adjustable cable angles and compact exercise variety matter more than a dedicated station's narrow specialization. A functional trainer is a type of cable setup, but it is usually built around movable pulleys and multi-direction training.
That distinction matters in a home gym because space and routine flow are limited. A dedicated lat pulldown or low-row machine may feel better for one movement. A functional trainer may earn the space when the user needs presses, rows, flyes, chops, curls, and accessory work from one footprint.