AWS Savings Plans Vs. Reserved Instances: When To Use Each
A decade after launching Reserved Instances (RIs), Amazon Web Services (AWS) introduced Savings Plans as a more flexible alternative to RIs. AWS Savings Plans are not meant to replace Reserved Instances; they are complementary. SPs and RIs have some significant differences that make each better suited to specific uses. As an example, while Savings Plans are applicable to both EC2 and Fargate instances, RIs are only applicable to EC2 instances.