different ball, different era, different oil, different oil patterns.
As good as the Inferno may be, it's just not as ground-breaking nor as different from all other balls, in the same way the DZ was. There are many, many great balls out now, mostly because there are so many and designers are bound to get good or get lucky with all the new technology currently available.
The Inferno has a different cover (stronger), lower RG, much more differential, than the DZ.
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"Just because you can do something does not mean you should do it."