The Untamed, out of box, will roll sooner than the Inferno. The Untamed has a dull cover where the original Inferno comes polished. With that said, due to the Inferno having a polished cover, it will also have more backend, due to the polish skidding and retaining its energy, where the Untamed's dull cover will try to roll sooner. You can always polish the Untamed or try to sand the Inferno, but I have found Track's covers to be more friendly to changing the surface than other brands. Can't say nobody compares, but for the most part, Track has pretty good versatility.
If you have any more questions, just write!
Thanks!
GO TRACK!
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Clint Daley-Owner
Lets Go Bowling Daley
Salem, Ohio 44460
TRACK ADVISORY PRO SHOP STAFF