Tut tut Ian, you need to do your homework
Here are the Sony Music's:
http://www.sonystyle.com/is-bin/INTERSH ... RM80LS2KIT
And here are the Maxell CD-R Pro's:
http://www.maxellcanada.com/computer_pr ... CD%2DR+Pro
So what's the difference?
...Maxell CD-Rpro Disc is triple coated for maximum scratch resistance and longer life.
The Maxell CD-R Pro's have extra layers of protection compared to the Sony's. Out of all the CD-R products regularily available in North America, I think the Maxell CD-R Pro's are probably the best in terms of initial burn quality and long term storage. Although that opinion might change, as I know at least one company is working on a new gold CD-R that might do well. But currently, I'd say go with the Maxell CD-R Pro if you're looking for high quality data storage.
On top of the above, just because 2 discs share a similar ATIP, doesn't mean they're born equal.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media