Map the geometry and datum strategy
The right starting point is the number of faces, compound angles, deep features, and datum transfers required by the part.
Measure setup time and variation
Fewer setups can reduce handling and datum transfer, but only when workholding, probing, tool access, and process planning support the intended result.
Compare the whole machine package
Review spindle, rotary table, tool magazine, control functions, simulation, coolant, chip handling, and inspection rather than comparing axis count alone.
Use the production target as the decision point
Part complexity, batch size, material, tolerance, operator skill, and future product mix should all be included in the technical discussion.