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Blown Cellulose has the higher savings, lower costs
"R-Value" (an expression of heat transfer resistance) is the standard for measuring insulation performance. At R 3.6 to 3.8 per inch, blown-in cellulose insulation is considerably better than fiberglass insulation which has an R-value of about 2.2 to 2.6. But R-value is only one factor in the energy efficiency of a home. Studies of actual buildings regularly show that cellulose-insulated buildings may use 20% to 40% less energy than buildings with fiberglass, even if the R-value of the insulation in the walls and ceilings is identical. One reason for this is the capacity of cellulose to stop air infiltration and heat-zapping convective air currents within your walls and ceilings, which are inherent with most fiberglass insulation.