well, id have to say plugging roxicodone (IR 30mg oxy) is the ROA i find most enjoyable because it feels stronger than oral oxycodone, hits you just as fast as snorting does, and lasts just as long as oral (4-6hrs)
some people like to IV oxycodone, but i find it very frustrating because there is not really a rush, and the high only lasts ~2hrs. i remember when i was strung out on heroin and did a roxi, i had to do some more opiates in 4-5hrs or i would go into withdrawal.
snorting oxy has about 60% BA and lasts about ~3hrs, and effects can be felt in 5-10mins.
smoking roxi is fucking stupid if you ask me, but i have never tried it. some people only smoke their pills, but you destroy soo much of the active oxycodone!