These are incredibly different skis.
The Kuro compares more with a K2 Pontoon. It is a forward skiing powder machine that is groomer capable
The Hell Bent compares more with a Line EP Pro or Atomic Bent Chetler, etc. The closest Volkl comparison is probably a Chopstick. The Hell Bent is an all around play ski (forward and switch). It is at home both off piste and on most groomers.
Use the search function both here & at TGR & probably New Schoolers to read more about these skis.
The first question is "what do you want to do?" The next one is which brand/ski meets satisfies your personal preferences better...