Supercharge or Hellcat?

From what I've read, Chrysler spent a LOT of effort designing the Hellcat SYSTEM.
As in, they didn't just stick a blower on one of their motors, they spent a lot of time redesigning parts so you can run it on the track and not have it derate power after a few laps (Corvette) - plus, the factory warranty covers racing on the Hellcat.

So, depends on what you want and how much you want to spend, but the Hellcat should, overall, perform better over varied conditions and extended usage than if you just get your SRT blown.