Since I've really started paying closer attention, I've noticed in the last couple years, Roto Grip seems to be putting out equipment that hooks later in the lane, where Storm seems to be more mid lane grabbing.
Put it another way, I used to enjoy my Hy-Road. But I developed past it, and could not use it towards the end. I now very much enjoy the HP4 line, but Storm hasn't caught my eye on a ball since the Nano's, which I was too late to the party for.
If you ask me, I would say a higher rev, more power player is likely to enjoy the Hyper Cell more than the Zero, and possibly a Lower rev, more feather shot will like the ZG better