If you want the best DVD-writing, get the NEC.
If you want good reading abilities and fast CD burning, get the LiteOn.
The LiteOn's burn quality is not as good, but it excels in the other areas. If the burner will be the only drive in your computer, then get the LiteOn. If you have other good drives that you can use to write CDs or read DVDs, then get the NEC. Personally, I'm a very happy LiteOn owner.