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I think choosing the right Linux distribution for running Oracle software was never easier. Perhaps the following can help you. It's mainly a cut and paste from my own notes.
Oracle Linux is distributed as Open Source under the terms of GNU General Public Licensing (GPL). You can use the software free of charge for all purposes, even for running your business. Since March 2012, also Oracle Linux updates and errata are distributed for free and do not require a paid subscription.
With Oracle Linux you have only one vendor for your OS and Database product support and you can opt to choose a ULN subscription. Basic support will give you full access to use the Management Pack for Linux built into the Oracle Enterprise Manager 12c. And last not least, check the Linux vs. Red Hat Enterprise Linux cost calculator. If you are a Oracle database customer, Oracle Linux is probably a much better deal anyway.
Other reasons for running Oracle Linux:
If you need kernel driver support for Oracle specific products such as OCFS, Btrfs, ASMlib, DTrace, Ksplice, then you need the Oracle UEK kernel. There is no support for RHEL 6. To my understanding, this is not because of Oracle forcing you to use Oracle Linux, but because of Red Hat politics to undercut Oracle and Novell (SUSE) with hidden patches trying to hide information from competitors that is essential to providing support for RHEL specifically.
For information about the Oracle UEK kernel:
If you want virtualization for an Oracle production environment, check out Oracle VM server for x86, which is free.
Your question about TSM support requires more in-depth analysis about your TSM licenses and implementation. I suggest to contact IBM support. I have no doubt that IBM will want to support Oracle Linux. If it does not, or not yet, there are most likely ways around installing the TSM agent on your Linux server. I would rather not want to dismiss all the benefits of Oracle Linux because of Tivoli TSM. The Oracle UEK2 kernel is based on the 3.0 mainline Linux kernel. Oracle Linux also installs the original RHEL kernel and is fully binary compatible.
I think the above leaves no doubt that Oracle Linux is your best option.