For me it was the other way round, I was in Argentina and I could get a bottle of 30 OC 40s for 150bucks, or buy for 5-6bucks a 40.
On the other hand I could get awesome H, light brown powder straight from Colombia that was there to be smuggled to the states, at least 85% purity, the best dope I had in the world.
But since there was no H scene in Argentina and I was getting it from very professional dudes who were extremely cautious and secretive and you had to buy at least 2 grams, and no more than 5 at a time, and it was 400$ for 2 grams.
It was really worth it, but very difficult to come up with that money at a time, and since I could buy oa couple of oc's at a time,that was what I was addicted to, and getting oxys was less time consuming and way easier for me.
Of course whenever I had the money I did H, but I was addicted and for daily use the oxys were much more convinient, exactly the opposite of what happens in the states.
And yeah the rush of IV H is impossible to compare to oc's, but for daily use and funcionting snorting H or OC was pretty much the same, the H gave more euphoria and that warm feeling, but the oxy was more versatile, and got me more motivated, but bottomline is when you are addicted any strong opiate will do the trick in the right dose.