Quieter and Quality burn model?: GSA-E60L or GSA-E40L?

Would like your help again.
Looking for an external DVD drive for my laptop.

Initially, I was between Samsung and LG.
And after reading some reviews and threads, I think I am going for the LG burner.

Now, I want to know which one model is “quieter” and “achieves quality burn discs (DVDs).”


Could you please asvise me on this? Speed is not so much the factor to me.

Also, it appears that these models doesn’t have on/off switch.
Does this matter? I was hoping to turn the DVD drive on/off by the switch when not using.

Thank you in advance!!