It also depends a lot on the writer.
Some writers is not so happy with ricoh (LG GSA-4040B, pioneer writers and the NEC ND-1300A for example) while some other writers works superb with ricoh (NU DDW-081/082 and NEC ND-2500A for example).
MCC seems to work better in some drives. But it also depends on who made the MCC discs.
Made in Singapore (real mitsubishis) is the better ones to my experience.
Made in India (Moser Baer) is also good in most cases but tend to be worse near the end of the disc.
Made in Taiwan (CMC Magnetics) is the worst to my experience. While not bad they seems worse than the other two types. Some causes high PI/PO values in the beginning of the disc.