Cut, due to the versatility of use. It's both new and old. Spark erosion isn't really as versatile for anything but nails. Also hampered by the border around the surface.
Neither!I'm not filing down my toenails with the same knife I use to cut my food with. Or vice versa.
That‘s why one has different SAKs...
Or the small bottle of hand sanitizer in the pocket!
I keep my finger nails very neat for work so I trim them weekly with Classic scissors and do the rough filing with the Classic then swap to my Exec for the final filing touch ups.All of that being said, as I don't use the Cadet on my nails I would prefer to have the file be useful on a variety of materials so I vote for the new File.-Wes.