Direct answer
Fiberglass batts have R-3.5/inch and zero air-sealing. Closed-cell foam has R-7/inch plus air and vapor barriers in one product. Fiberglass also sags and degrades; foam lasts the lifetime of the home.
Authoritative sources
- US Department of Energy ↗
DOE Energy Saver guide to insulation types, R-values, and recommended applications.
- IRS Section 25C ↗
Energy Efficient Home Improvement Credit — up to $1,200/yr for qualifying insulation work.
- Energy Star ↗
Energy Star recommendations for attic and wall insulation R-values by climate zone.
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