Definitely Joliet.

Joliet CDs are actually ISO9660 CDs with 8.3 names plus an extra part including the long filenames. I don't know about OS-X, but OS9 Macs (by default) will not read the long filenames and use the 8.3 versions underneath - in other words: "default" Macs will display 8.3 filenames no matter whether you turn Joliet on or off.

BUT... you can direct your Mac customers to http://www.tempel.org/joliet/ and recommend to install the "Joliet Extension". This is a must have, and once it is installed the Mac will start to use the long filenames.

So the results are:

1. Joliet off

• 8.3 names on PC
• 8.3 names on Mac
• 8.3 names on Mac with Joliet Extension

2. Joliet on

• long names on PC
• 8.3 names on Mac
• long names on Mac with Joliet Extension

So, Joliet wins 2:0... :-)