When should I choose Provisioned IOPS over Standard RDS storage?
A.
If you use production online transaction processing (OLTP) workloads.
B.
If you have batch-oriented workloads
C.
If you have workloads that are not sensitive to consistent performance
A, If you use production online transaction processing (OLTP) workloads.
http://www.aiotestking.com/amazon/when-should-i-choose-provisioned-iops-over-standard-rds-storage/