I find Disc Quality scanning to be almost totally useless. I prefer ScanDisc checking, and/or if required, the TRT part of the benchmark test to be more informative. In my experience, C1/C2/PIE/PIF testing has only every told me anything useful in extreme cases - i.e. extremely good burns like second generation Tayio Yuden and MCC on a new DVDRW drive, or where extremely good results are expected, or extremely bad, showing a block of large volume C2 Errors/PI Failures.
For example, with ScanDisc, I will check the disc, and if it shows damage/bad areas affecting files, I'll check it out with my other drive and if it agrees that there's a problem (other than a few bad sectors at the end, something old burn software/hardware used to do, these don't affect files) I throw the disc out. Likewise if a TRT shows transfer rates dropping off dramatically, Adios to that disc.
Regarding these two specifically, TYG02 and MCC 004, in all 3 metrics, TRT, PIE/F, ScanDisc, I find that the results between them to be broadly similar, but ATM I have more confidence in MCC 004.