Make the choice from the job
Begin with the load path and shell design, then add infill only where it supports the use case. A dense infill is not automatically a stronger part.
What people often miss
Printer condition, material formulation, model geometry, orientation, and post-processing can change the outcome. Treat a comparison or troubleshooting step as a decision framework, then validate it on a representative print.
Use the workbench for the numbers
These tools help turn the decision into a material, cost, dimension, or time check without pretending that one generic setting fits every machine.