Ironically, I wanted this car, but only as a manual in 2014. I was a manual or nothing kind of guy back then. Can't say i'm proud of it as it clouded my view of owner's as well. I would look in windows at car shows and dismiss cars that were automatics. However, once the 2015 SS's arrived and I test drove the manual and automatic, my world view changed. I still have 3 out of 4 manual cars in my fleet, as I love a good shifter and clutch, but I found the SS to have a fine shifter, but a really terrible clutch. 3 years later with an auto SS. With supercharged torque, the SS is my "gigantic, easy power everywhere car", a good fit for 4000 pounder IMO. Freeing up the right hand has done wonders for steering and braking control, no more heel toe needed to downshift makes for a much more even and controllable brake pedal. While its an auto, I use the paddle shifters much of the time as I like to downshift while braking and I also like to creep around in traffic leaving it in 2nd gear instead of it dropping to 1st which is just not needed with over 300ftlbs available just off idle. Ultimately, I don't think the transmission makes this car, but i'm sure it does for some. To me, I always wanted a SBC with that small block soundtrack, in a family friendly package and either manual or auto SS would fill that role.
So, my advice is to drive both and decide, but I can understand that is very difficult now that the car is out of production and they sold so few to begin with. Good luck.