Depends on whether you want to scan DVDs or CDs, and whether scanning speed is important.
For scanning DVDs at a reasonable speed, a LiteOn DVD burner is the better choice IMO - especially the models that also support TA Jitter scanning.
For scanning DVDs where speed is irrelevant, a "real" Plextor DVD burner with a Sanyo chipset is hard to beat (although it's very difficult to interpret normal Jitter reported by those drives - TA Jitter is much easier to interpret). Such drives are no longer in production and are very hard to find (e.g. PX-760/755/716/712).
For scanning DVDs "real" BenQ drives using Nexperia chipset are also good, although they have some quirks that make me trust them less than LiteOn scans. These are also out of production and hard to find (e.g. DW1655/1650/1640/1620).
Some other drives can also be used for scanning DVDs but provide less information (i.e. no jitter) and/or have other quirks. The Optiarc 5200/7200 series might be OK scanners, but don't report jitter and report inflated PIE numbers (bytes instead of rows in error).
Some drives can scan DVDs but produce such varying or random results, that it's better to ignore the scanning function of such drives. Optiarc 3550/4550 and 5170/7170 series drives would be examples.
If you're interested in CD scanning, I'll add my thoughts on that later.