For higher R-value and to minimize thermal bridging, open-cell spray foam between studs is better than closed-cell spray foam.
Air Gap Between Insulation and Drywall : r/buildingscience
Flash-and-Batt Insulation - GreenBuildingAdvisor
Spray foam insulation - GreenBuildingAdvisor
Foam insulation : r/Homebuilding
Can Open-Cell Foam Waste be Used as Attic Insulation? - GreenBuildingAdvisor
Installing Closed-Cell Spray Foam Between Studs is a Waste - GreenBuildingAdvisor
High Density Low Expansion Spray Foam Prices Clearance
closed cell spray foam insulation Archives - Hansen Buildings
CE Center
Three Code-Approved Tricks for Reducing Insulation Thickness - GreenBuildingAdvisor
Is Using Closed-Cell Spray Foam Worth the Trade-Offs? - GreenBuildingAdvisor