It really depends. Given the type of pain and other individually mitigating factors such as physiology, tolerance, other medications being taken, etc. either has the potential to provide greater pain relief than the other in a given circumstance.

Despite its relatively new existence in the U.S. market (10 years or so), it has been widely available in Europe as one of the preferred analgesics, even among the available opiates at the time. I certainly wouldn't discount its potential out of hand.