Here we come to what I alluded to in my first post. No single scan, not even a LiteOn or BenQ scan, is “reliable” in a way that it can assure you of trouble-free reading/playback of a disc under all circumstances.
Furthermore, each drive, even one of the same brand and model, is different and can yield a different scanning result. This should be enough to tell you that a good scan is only an indication, but certainly no guarantee for a well burned disc.
We can assume that scanning with CDSpeed was blocked at the request of Samsung. Some of their drives give off usable scans, others don’t.