I am not aware of any UCS-X best practices. However, as of UCS firmware version 4.3.2, you have the choice to set up a domain in IMM, or in UCS MM. UCS 4.3 supports X9508 chassis, IFMs and X-Series servers.
I have no idea why there are 2 diferent tables. The top table is out of date, since it does not list UCSM compatibility.