I see very little difference in burning quality. With early firmware the 755 seemed to dislike CDs a bit but seemed better with DL media than the 760. This seems to have evened out a bit, but originally could also have been a variance by individual drive, not by series.
BTW: With FW 1.05 the 760 has been updated, so there are now the following differencies between 755 and 760:
- 18x +-R
- 8x -RDL
- 16x pressed DL reading