It’s clear from this Wikibon Report that the costs of running mission database workloads in traditional datacenters and RDS on AWS outposts are 2X higher than Oracle Cloud. 

To learn in detail, download this Wikibon research that focuses on IT operational costs for running large mission-critical applications on Oracle Cloud Database Enterprise Edition in an on-premises cloud environment. It compares the operational IT budget costs for a traditional IT datacenter with a multi-vendor Do-It-Yourself (DIY) infrastructure, AWS running Oracle RDS on Outposts, and Oracle Autonomous Database running on Oracle Exadata Cloud@Customer X8M.