High Level Compare Oracle Database 21c vs PostgreSQL 13 Installation

Install Oracle Database 21c on RHEL 8

Oracle is still using decades old runInstaller to install software and dbca create database using response file.
Need to manually configure AutoStart of Oracle Database with systemctl.

Install PostgreSQL with pgAdmin on CentOS / RHEL 8

Install and initialize the Postgres database is simple:

# dnf install -y postgresql13-server
# /usr/pgsql-13/bin/postgresql-13-setup initdb

Services are automatically configured with systemctl.

Lastly https://www.centlinux.com/ excellent articles.