I think the Sony D11 and the MCC 003 discs both look very similar in terms of quality.
CDSpeed reports a quality score of 97% for the Sony D11 and 95% for the MCC 003 - very similar scores, based totally upon the maximum value of the PIF's. The Sony D11 PIF total is a very low 343, which I feel is EXCELLENT, but the MCC 003 is still VERY GOOD with a PIF total of only 1443 (I like this number to be below 2000). Both discs are VERY acceptable in terms of PIF's (generally considered to be the most important indicator).
However, the Sony D11 PIE total is a bit higher than I like at 201,965 (I prefer this number to be under 100,000). In contrast, the MCC 003 PIE total is EXCELLENT with only 5986 errors. Although good PIF values are significantly more important than PIE values, PIE values should still be considered. Since the MCC 003 PIE total is more than thirty times less than the Sony D11, and since the PIE max for the MCC 003 is more than five times less (7 vs 38), I'd probably choose the MCC 003 discs if I had to pick one type over the other.
As far as choosing an older firmware (B7P9) over a newer firmware (B7T9), I'd advise a very slight bit of caution. To me, both of your MCC 003 scans look identical (I don't feel that the 95% versus 97% quality score difference is significant). Note that firmware bugs are generally corrected by the firmware engineers in the more recent firmware releases, as they are discovered. By running an older firmware, even if it appears to scan slightly better, I feel that you are running an unnecessary (but perhaps very small) risk. There have been several reports that movies written with B7T9 will play better (despite the very slightly worse quality scans) than the B7P9 firmware. Personally, I'd only revert to an older firmware if the media scans for the discs that I burn look SIGNIFICANTLY worse than those with the more recent firmware.
So is it a case of if a disk has less than say 100 PI Errors, no more than 16 PI Failures, zero PO failures then it is good enough ?
In general, I'd say that's a fair assessment.