Macintosh operating systems were designed to accommodate both PostScript Type 1 and TrueType fonts. We recommend that you use PostScript, as it is required by the more complex graphic applications (like Illustrator, FreeHand, or CorelDRAW), most service bureaus, and most printing facilities.
The more complex graphic applications require PostScript, as do most service bureaus and printing facilities. However, the TrueTypes are easier to use and install, they can print on non-PostScript printers, and they work just as well as PostScript for the vast majority of projects. In general:
Use TrueType fonts in
page layout programs
word processing documents
Use PostScript Type 1 fonts in
complex graphic applications (like Illustrator, FreeHand, or CorelDRAW)