Hi
I have installed both RH and SUSE for ppc64 on LPARs of p690 and p5 servers without problems at all. Only concern about newest disks and RAID adapters and support for them in the Linux version to be installed. Personally i prefer SUSE because of the Yast interface and the way it manages the disk partitioning and Volume administration. Another point for SUSE: it has support for IBM JFS while RH does not.
I have installed partitions on RH for SAP Netweaver and ran ok. And have installed Suse 9 on JS21 partitions using IVM to run SAP Netweaver and everything OK. What i've tried to do without success was install Debian on Power.
So for your question, every OS has it's advantages and only way to know them is to install and test.
Hope this helps
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