the yamaha got's a giant 8mb buffer. Reviewer's say they had to go thourgh extraordinary lenghts to get the IDE plextor 12/10/32 with 2mb buffer to activate burn-proof. Now yamaha 8MB buffer = 4X larger than plextor 2MB buffer. Yamaha 16X speed = 1.33X faster than plextor. That means, it's gonna take sumthing cataclysmic to get a buffer under with the yamaha.
So in conclusion, the yamaha. Unless you tend to defrag your HD, benchmark HD, and play UT at the same time as u burn cd's.