HyperCell and Mutant Cell pearl are very different balls and looks. The Hypercell is much stronger in the midlane while Mutant Cell Pearl is cleaner through the heads with more on the backend.
IMO, the HyperCell is hits like a truck but I think the OOB 2000 surface is too strong for THS. I took mine to 4000 and will be trying it out this week.
MK