It is generally better to buy recycled aluminum foil. Recycled aluminum foil is more environmentally friendly as it reduces the need for mining new aluminum and conserves resources. Additionally, the production process for recycled aluminum uses less energy compared to that of regular aluminum foil. However, it's important to consider the quality and performance of recycled aluminum foil, as it may vary. Always check for certifications or labels that indicate the product is made from recycled materials to ensure you are making a sustainable choice.