The first that I was thinking when I get of Oracle Enterprise Linux(OEL) is cheaper than others enterprise operating systems, second is that is Oracle products friendly, I used the first version of OEL and my good impression was/are:
1. Kernel with support ASM native, it's not necessary to determine versioning ASM kernel, the repositories automatically download required versions, without dealing with license acceptance.
2. Oracle DB Prerequisites is easy install with only download a packages: oracle-rdbms-server-VERSION-preinstall, it automatically downloading and installing any additional software packages, creating the user oracle and the groups oinstall, modifying kernel parameters in /etc/sysctl.conf, power off NUMA support on systems, etc, this could take hours on other operating systems.
3. Basically, OEL is tuning for optimal performance of the database MySQL and Oracle Database v11/v12.
4. And not more important, patches of Oracle Database products are released on OEL first.
IMHO (and professional), OEL is optimized for Oracle Products: Oracle Weblogic, Oracle DB, Oracle MySQL, Oracle Primavera, etc, but if my business don't need other Oracle products, so, I should analyze and using other distributions.
Recommendations to others considering the product
If you used an Oracle Product on you IT Business company, have more sense used OEL as your operating System, at least for running the databases.
Fast deployment of multiple Databases on client IT Bussiness, misconfigurations can put your data at risk, spend time and effort, OEL is faster to automated database deployments with Oracle Real Application Clusters(RAC) and PUPPET, it has helped me save a lot of time and effort.