What material is best for cupcake molds?

Silicone and aluminized steel are the two most popular choices. Silicone is flexible, non stick by nature, and dishwasher safe ideal for easy release and cleanup. Aluminized steel conducts heat more evenly and is more durable long term, making it the choice of serious bakers. For most home bakers, either works well; the best choice depends on whether you prioritize convenience (silicone) or performance (steel).