Casting vs injection molding—which method works better?

We actually did something similar on a custom staircase project a while back. The main structural components were injection molded for strength and consistency, but the decorative elements—like the handrail brackets and finials—were cast individually. It gave us the reliability we needed structurally, but still had that handcrafted feel clients appreciate. Worked out pretty well overall, though it did add some complexity to the assembly process...