Ok so the results are pretty much the same. The new disc also has marks although smaller
The surface scan is better than the first burn but it's probably due to the fact that crappy quality blu-rays are like this, some better than others, even from the same batch.
I was really curious to know if someone already had this "problem".
For now i'm going to believe that the burns are good and with luck they will last me some good years. I'm not using them as backup media so it's ok if they stop working.
Just out of curiosity, i tested some old dvd's i had laying around, most from 2006, some from 2005, brands line "princo, prime disc, rivision", they were the cheapest i could find at the time and they all read fine.. the drive doesn't even struggle in the beginning, they are immediately detected and i can browse them very fast.
I then tested even older CD-R's, most from 2001 and one from 1999 (with a deep blue dye), again they were all recognized and the data seemed fine, only one struggled a lot in the beginning but it was the only one with scratches.
After all this time i thought they were completely gone..