I just got an opinion from someone who is not a camaro enthusiast or not even a car enthusiast to just get a perspective from a neutral party. Yes, they are a girl.
10-13 design looks more fierce and meaner.
14+ design looks more luxurious and geared toward a soccer mom. Yes, she literally said soccer mom.
She thought the 10-13 design looked more aerodynamic, which we know is not true as GM has advertised the 14+ style to be more aerodynamic.
She commented that the 14+ taillights were like any other car. She said she would have never thought about taillights if I haven't pointed them out, but she like the 10-13 design better. She said the 14+ taillights looked plain like a toyota camry.