A torch is the better everyday emergency light: brighter, reusable, easier to aim and far more useful for moving around a dark house, checking a fuse box or walking home. Glow sticks are different. They are low-level marker lights that work without batteries, switches or charging, and they keep glowing quietly for hours once snapped.
In a UK power cut or storm kit, the torch does the active work and glow sticks do the marking. Use a torch or head torch to see what you are doing; use glow sticks to mark stairs, tent lines, children, bags, door handles or a car breakdown spot without draining batteries.