We'd recommend an Adaptec card for PC-based systems. Macs, of course, come with internal SCSI and long file names as standard features. In fact, ISO 9660 format automatically makes incremental backups, skipping unchanged files when recording multiple sessions. Avoid internal CD-R drives to maximize drive life. Heat is the issue here.
All external units have a fan.
Most internal ones don't get sufficient cooling from the system's fan. For authors who need to record both Mac and PC discs, Toast and a Mac is the best CD-R solution going. Mac discs can also be made bootable with Toast. We use Miramar's MacLAN Connect 6.01 to connect our Windows PCs and Macs. We then copy Windows or Mac data and application files to a Mac hard drive partition and then drag and drop the files into the Toast window.