Luck is very athletic, more so than Rodgers. Luck could do everything Newton does but that isn't part of his game. His athleticism is vastly underrated by fans.
Luck has good speed and is athletic....but he isn't in the ballpark in terms of being the same double threat in the rushing department. Luck can run....Cam is a significantly more dangerous however.
Luck also doesn't have Cam's arm.
I like Luck....but he can't do what Cam does. Cam's ceiling is higher. Luck IMO has better odds of reaching his though