In my opinion, pioneer is out of question. You can get cheaper burners that perform better (e.g., ND3500A).
If you want amazing overspeeding capabilities with many media types (i.e., burn crappy media at high speeds) as well as error checking with DVDINFOPRO go with BENQ. Please note that the RW writing quality of this burner is still not shining.
If you want a solid writer, which hardly overspeeds but provides superb quality burns on decent (hopefully) long lasting media, with DVD RAM capabilities for easy and error free and long lasting day by day backups, 16 PCAV writings and support for 8 +RW and 6 -RW then go for the LG.