For audio copy protections, get the Plextor.
For game copy protections I don't know.
Both do a decent job in analysing write quality.
I'm sure both will do adequate write quality on selected media , if not now then at least after some firmware upgrades.
I have no idea how well the LiteOn performs with scratched discs, something on which Plextor + PlexTools is quite good (if not among the best).
Personally I'll get the Premium Plextor, but only because I already have a 48x LiteOn and I sold my older Plextor and need a replacement to use with PlexTools.