I have a 15 M6 HC Challenger and my wife has an 18 Scat Pack Charger Daytona. The Daytona is definitely a better balanced, easier to live with everyday car but the Hellcat is such big, stupid fun, especially with a stick. And I agree about the Michelin Pilot Sports for tires, they changed the entire dynamic of the car to where it can actually be driven hard without breaking the tires loose every time you step on the gas.
Make no mistake, the new cars do not replace the old cars. True, they perform better in pretty much every category but they do not replace the amazing driving experience of a rumbly big block original 60s/70s musclecar.