Classical conditioning vs operant conditioning

 

 please watch the videos provided below. Explain the difference between Classical and Operant Conditioning. Which one do you agree with or which one makes the most sense and why? Also, do you believe that punishments and rewards are effective? Please explain why or why not? 

https://youtu.be/ne6o-uPJarA 

https://youtu.be/PRdCowYEtAg