Forging is limited to products of fairly simple design, generally without under cuts and sharp edges. Tooling costs for forging are higher than that of investment casting and sand casting. Drop forging offers good tolerances and repeatability.
Surface finish of drop forging is also ok but signs of the flash line may be visible. Forging is a cost effective manufacturing process for high quantity runs it is also used for items that require the grain structure/ mechanical properties resulting from the forging process.