Well, receptor affinity pretty much determines potency. I would say hydrocodone. While morphine and hydrocodone are said to have the same effects mg/mg when taken orally (I feel as thought the Morphine does more for my pain though) because of the oral bioavailability, hydrocodone is only 59% as potent as morphine but has a higher oral BA. Oxycodone is gonna have the highest mu-affinity as it is 1.5-2 times as potent than morphine (and 2.5-3 times as potent as hydrocodone). So in order from worst withdrawal to "best (for lack of better words)" withdrawal, I would say that oxycodone will have the worst, Morphine will be your middle-ground, and hydrocodone will be the easiest withdrawal. Bupe, I've heard, has one of the worst withdrawals as far as opioids are concerned which makes sense to me, as it's 40 times as potent as Morphine. I will say though, you're only on a C-III drug, so going in and asking for a specific C-II drug might not be a good idea as it tends throw up red flags for you being a drug seeker for abuse, misuse, addiction, or criminal diversion (selling them/giving them to others). I never ask for any controlled substances just so that I will be treated without being labeled a drug seeker, because chronic pain sucks, and I need SOMETHING stronger than OTC meds. I'm not too sure on half-life of those, and I'm pressed for time so I can't exactly look them up. Good luck on whatever you decide to do though, I need to make a thread to get something asked, and go get ready for class though lol.
P.S. There's also tapentadol, which I've heard is kind of like how oxycodone is to hydrocodone, but it's counter part is tramadol. Sorry, I know that's worded weird, but I'm sure you'll get the idea.
