Cloud Platform Comparison: Database
AWS
RDS: MySQL, SQL Server, PostgresSQL, etc. A/B Failover.
Azure
GCP
Cloud SQL: MySQL, PostgresSQL only. You can create A/B Failover. Read replica supported but load is not automatically load balanced. You’ll have to manually configure your application to use the read replicas. The larger your disk the more I/O performance you can get out of disk.