Really tough to say, since neither is true vintage. Original DZ had pk 18 shell which was stronfg and long lasting. Original Inferno had activator, which was just a modified PK 18. It was the rough buff finish that made the inferno so much stronger. Neither of the current balls have the original shells. They have tried to make them stronger to match up with the super high viscosity oils. However I found the new DZ to act nothing like my original. Maybe different oils, maybe bad core shell matchup.