IMHO Mitsui are the best by far! I did a true double blind listening test on the following CD-R's and found that the Mitsui was sonically superior in every way;
Tested against; Memorex, TDK, Sony, Phillips, and Maxell audio Cd-R's.
It is my understanding that the majority of the differences between these discs is in the "goo" inside these blanks, which changes "states" as it is burned by the laser. Only Mitsui and Phillips had discs available that coule be placed in direct sunlight for 100 days and still maintain their data integrity. Mitsui has many unique patents on their particular "goo" and they are preferred by many industry insiders as the CD-R of choice.
I was quite surprised that these discs all sounded slightly different, but they all did have their own unique "goo". The Mitsui actually look slightly pale in color as compared to the other CD-R's. Interestingly, the second best sounding CD-R was the Phillips, which also was pale in color as compared to the other discs.
The above comparisons were made on CD-R for audio discs. It is my understanding that Mitsui's gold (for computer burners) is the "best of the best" in that venue, but I have not heard a comparison to verify that particular claim for computer based burners. It is ture though that the library of congress uses gold Mitsui exclusevely for their archiving.
Here are some other things I learned when I researched how to make great sounding CD-R's:
Always burn at the native speed of the burner. Slower speeds do not really work as well as the native speed.
Some burners allow you to make copies of copies and sometimes the second copy (of the first copy) actually will sound even better!
If you are using a computer, Plextor seems to be most consistent brand
that will always give you good sonic results, i.e Plextor seems to be the "sure thing" in computer based burners.
If you are using a computer, "re-rip" your data (to remove the inherent jitter) prior to re-assembling and sending it directly to the computer's burner. (Apparently there is software that will do this, but I cannot tell you any more than that.)