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I'm assuming new construction. Blown walls do a better job of keeping air infiltration down and don't have issues with fitting correctly in odd spaces. Around here, the better companies will use batts in the attic, and then blow over the top of them.

I think a $6K blown fiberglass job in NJ is going to have a pretty long payback period. Air infiltration is better addressed by air sealing during the build - not making a leaky shell and trying to slow down the leakage.
 
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