I spent a good portion of my day setting ride heights, corner weighting and aligning this 7.3L FI Challenger. It has every available Pedders Suspension and Petty's Garage Chassis part. I am well aware of exactly how good or bad each of the Modern Muscle Car Chassis are and how to fix them.
The G8 was built on a ZETA chassis. The Camaro is built on a ZETA II chassis. The differences are minimal with the ZETA II a bit more robust with larger ball joints, ball studs and front knuckle / strut clevis. Arm lengths and geometry are almost identical.
On a road course the G8 longer wheel base handles better than the shorter wheelbase Camaro. The Camaro so no slouch. I should know as Pedderised Camaros have been consistently the faster modern muscle cars to run at the OUSCI since 2009.
The SS will run on 'ZETA III' the VY chassis. You can expect it to handle exceptionally well from the factory. The limiting factor from an aftermarket perspective will be the amount of rubber we can fit into the wheel wells.
The LX/C MOPARS suffer from exactly the same issue. Too much car and not enough rubber. They also are very limited in rear sway bar size and are heavier than the Camaro, G8 and I would guess the SS.
The big plus for the LX/ C is it has front upper control arms. We make good use of them
We have built and been involved in the builds of some of the most extreme and powerful MOPARS, Mustangs, G8s and Camaros. My builder-dealers can make massive reliable power in all of them. We can get that power to the ground. My second car was a HEMI Charger. I spent many years looking down my nose at Ford and Chevy. At this time I have a bias toward GM with the Camaro, G8 and soon the SS. My business takes me past that bias and I enjoy making all of them better. I had a great time today with Mike and Jim and the Challenger

My best Ford, Chevy and MOPAR builds are all almost identical in performance. There is an equalizer at work. None of these vehicles have enough rubber for their RWHP, BHP and Weight. We run out of tire. We don't run out of car.
Now I'll sit back and listen to the rest of you debate which car is faster or better built