It depends on what you are trying to achieve with your insulation. Batt insulation is a good choice for insulating an existing building because it is easy to install and does not require special tools or training. However, batt insulation is not as effective at preventing air infiltration as blown-in insulation. Blown-in insulation is more expensive to install, but it is more effective at preventing air infiltration and therefore provides better insulation value than batt insulation. Blown-in insulation can be installed in any type of building, including new construction or renovation projects.