"Generally speaking, it is easier for Solaris
administrators to make the transition to Linux than AIX
administrators because there are more files that need editing on
both Solaris and Linux. Both Solaris and Linux are also more
command-line driven than AIX. One advantage you will have as an AIX
administrator is that the hardware is the same, so if you're
familiar with Virtualization using AIX on System p, you'll find a
lot of similarities. If you were using Red Hat Enterprise Linux 5
(RHEL5) on an x86 box, you would be using Red Hat's Xen-based
virtualization process (see Resources for more information on Xen).
On System p, you'll be using the same PowerVM™ that you are
using on AIX"