What were the differences between the ancient Greek theater and the ancient Roman one? What do you think caused these differences?

The differences consisted in the fact that the ancient Greek theater was represented by two genres (tragedy and comedy), while in ancient Roman entertainment, for example, gladiatorial fights to the death came to the fore.
These differences were due to cultural differences. The ancient Greek theater was a tool for educating citizens, and the ancient Roman theater was less addressed to the inner spiritual world of man. The Greeks glorified the free person, and the Romans were a much more warlike people, for whom military valor was one of the highest virtues.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.