Silver is brighter and more light-reflective — it reads as a clean, slightly luminous grey. Ash has a slightly cooler, more muted quality — it reads as a composed mid-grey without the brightness of Silver. In the Icicles jacquard, Silver picks up light more actively across the panel surface. Ash is quieter. If the room has good natural light and a bright, contemporary aesthetic, Silver is the stronger choice. If the room is more understated and you want the curtain to recede, Ash is the better option.