I have never IV'd anything, so i understand that my opinion does not mean much here, but from what i understand, nothing is going to compare to IVing something, because theres no rush from consuming it orally. Its much more gradual than IVing something. Also, even though oxycodone's bioavailability is something like 93% orally, its 100% intravenously, so there will be almost no comparison here.
That being said, i would obviously not advise you to try shooting oxy (assuminig you have not done so before).