I have never taken either what I can tell you is pregablin is gabapentin with a couple molecules rearranged .
Pregablin also "officially denies" that it's addicting choosing to call it discontinuation syndrome , where i come from that's called addiction/dependence.
I am a chronic pain patient with a hard head and years ago i one doctor who everytime he got near me he tried to talk me out of what was treating my pain and try the drug dejour he was trying to peddle I don't like the science behind either drug and absolutely refused to take them , my first appointment with pain management was seeing every kind of specialist on earth to determine if I needed mental help , physical help or pain management some of those doctors gave me a passing grade when they found out I wouldn't go near either gabapentin or pregablin that should tell you something , they agree I am better off on opiates than those drugs ! That is one he'll of a condemnation from doctors especially with the opiate phobic state were in .