newer challengers

I have had both the 6spd and auto. I must say I like the auto better. When it comes to new '15 or newer or '14 or older it's simply a matter of personal taste. I happen to like the older '14 down. like the grill tail lights and no frills interiors.
Do you just want transportation or go fast? If you want to go fast get the 392.
If you want good transportation you can make some adjustments (bolt ons) go with the 5.7
The 5.7 are more plentiful.