SJTW vs SVT cords: SJTW wins for outdoor and heavy-duty use

SJTW has a thicker rubber jacket, is water-resistant, and stays flexible in cold weather, while SVT is a light-duty vinyl cord that cracks easily and isn’t sealed against moisture. SVT is fine for indoor lamps and small appliances, but for anything outside, in a garage, or with high power draw, go SJTW—the few extra bucks are worth the safety and durability.