What is better than spray foam insulation?

What is better than spray foam insulation depends on criteria like cost, R-value, eco-friendliness, and application, but alternatives that can be better in certain aspects include rigid foam board, mineral wool, cellulose, and fiberglass batts, each with advantages over spray foam, similar to alternative organizers for different needs. For cost-effectiveness, blown-in cellulose or fiberglass batts are cheaper than spray foam, providing good insulation at lower cost, though lower R-value per inch. For eco-friendliness, mineral wool and cellulose made from recycled materials are better than spray foam which uses chemicals and blowing agents with higher environmental impact. For fire resistance, mineral wool is better as it is non-combustible, while spray foam can burn and needs fire barrier. For DIY installation, fiberglass batts and rigid foam boards are easier and cheaper to install than spray foam requiring professional. For R-value per inch, closed-cell spray foam has high R-value around R-6 to R-7 per inch, but rigid foam board like polyiso has R-6.5 per inch similar, so rigid board can be comparable. So better than spray foam insulation could be mineral wool for fire safety and eco, cellulose for cost and eco, or rigid foam board for similar R-value with easier install, depending on whether priority is cost, fire safety, environment, or DIY, with no single insulation universally better, each trade-offs.