Only the BenQ can properly test CD burns. All the others fail at that task.
For DVD testing, you should use the BenQ or Lite-On preferably, and the Samsung can be on the bench as a backup.
For writing DVDs, use the BenQ with firmware BCIB, and use QSuite to disable SolidBurn for both known and unknown media (In other words, turn SolidBurn completely off [SB=OFF/OFF]. It has a bug with later firmwares, and it isn’t even needed with most burning situations anyway). Only feed the BenQ good quality DVD media.
Keep the Lite-On handy for burning crappy DVD media. A Lite-On drive with Force Hyper Tuning (FHT) turned ON can often work miracles with some of the most mediocre or crappy MIDs on the planet.
For writing CDs, things get a bit fuzzy, so I would stick with the BenQ. Although Pioneer and Samsung drives are generally known as being good CD burners, their latest models have not been as impressive according to recent tests, so the BenQ is the safe choice. Lite-On is generally not considered to be good at CD burning, so that’s automatically disqualified.