I have an LG, and it is pretty good. If you go to TOMS HARDWARE (
http://www.tomshardware.com) you will see a nice comparison between some burners, including the SONY, LG and the beloved Pioneer.
Tom's Hardware (which is a damn good web site in my opinion) opted to recommend both the LG and Pioneer, being that both are pretty good and have problems in the same area (writing to DVD+RW discs that won't be read by all readers). LG has the best DVD-Video ripping speed (if this matters to you), read successfully and very fast a scratched DVD, is a very silent unit... Well, I really like it, I have a LG Cd Burner as well for more than a year, that works wonderfully.
I agree with many, all around, to backup xbox discs, Pioneer has a slight advantage because the faster updates to the firmware to support new medias (LG updates the firmware as well, and A301 is a very good firmware) and because of the cooling that the pioneer has, if you burn a dvd after other, this is useful, but since I burn one or two dvds at most, this is not really an issue.
If the difference of price is minor and you don't care about DVD Video ripping, go with the pioneer, it won't let you down.
But if in your area the price difference is like here in Brazil (Pioneer is a good 100 dollars more expensive than the LG) or you really love to rip DVDs, the LG won't let you down as well. ;-)