I would think one would have to be more specific to "best value".
Espresso machine can be broken down to heated vs unheated, lever vs pump machines with further sub groups.
Grinders can be broken down to manual vs electric and even sub groups from their.
Only a value if it meets and satisfies the buyer's requirements.

Edit: Agree to that below V V.

Best value I think is the free information available at our fingertips in addition to the information we gather by collaborating together in this forum and elsewhere.