Just the location of the repository for the most part. If you're running Oracle databases on RHEL I recommend purchasing Oracle X-8 hardware and running Oracle Enterprise linux instead, you will save a lot of money in the long run
The biggest advantages OEL has is that if…
I typically ask, is it stable, is it Unix, can't it compete with Solaris on any level
The answer is typically no, with the exception of VM migrations. Of course, those don't really need to happen with Solaris and/or AIX, since the hardware they typically run on doesn't…