"And DVD-RAM has more defect management elements. Thus it's more reliable than +RW. But in my opinion +RW is a reasonable (and cheaper) substitute for -RAM depending on your needs."
And DVD+MRW (Mt. Rainier) is even closer to DVD-RAM. You still have to use the crappy packet writing software though with +MRW. I've used +MRW for backups and wonder if it's "good enough" for that chore in most cases.
DVD-RAM Benefits: Much more reliable media, hardware write verification, better defect mgmt (better than +MRW?), no software needed for FAT32 on WinXP. Those are the biggies.
The software required for UDF 1.5 DVD-RAM is not packet writing software per se, is it?