They're both telling the truth--or at least, how they view the truth. You can see they both generally agree with where digital errors are, while the LiteOn is more picky. You can use this to your advantage: since you know the Samsung is more forgiving, you could know that if it shows a lot of errors, something probably went wrong. If the LiteOn shows a lot of errors, you could see that there was something that wasn't perfect, but you can still rely on it to tell you when things are and aren't okay.
Think of it as taking the average of both scans: one says it's good, the other says it's merely okay, the disc is probably merely okay. One says it's good, the other says it's good, it's good. One says bad, the other mediocre, the disc is probably questionable. And so on and so forth.