Well I have done both..got addicted to Heroin though. I mean they are two completely different but highly addictive drugs. It also depends on how you use though..like if you snort,smoke,or IV. I've heard more than once "It's not what you do , its how you do it." Soooo to smoke meth...or to IV heroin..I'd say Heroin is more addictive. Just depends on what ya into.
In terms of getting one hooked faster and making a lasting first impression, ROA certainly makes a difference. I'm not so sure method matters that much in the long-term, though, once that honeymoon is over... People who love snorting or smoking heroin can have habits that last just as long as IV users, and the end-game IV addict who has lost all avenues will sometimes have to convert to snorting or smoking it unless they feel like risking an abscess every shot with an SC or IM injection. There's the difference of the rush with heroin, but ask most heroin addicts if they'd rather sit around shooting hydromorphone all day (much bigger rush, way shorter legs) or shoot H 3-4 times to stay high just as long and I think most would reach the conclusion that it's the lasting effects that make the habit, the rush just being the memorable cherry on top and the thing one looks forward to most while taking for granted the following 4-5 hours. IV users will read this (I'm one) and say "shooting it is much more likely to lead to a habit," but among those who find heroin's effects desirable, I would remind them the people who refuse to acknowledge their frequent snorting/smoking H as a habit of similar degrees in terms of psychological addiction are a sanctimonious lot who are often just as addicted but afraid of needles--either the stigma or the act itself
With meth, there's also a lot of variance among preferred ROA among users who have tried all routes. A lot of people prefer the body high from eating or plugging it--it's more of a functional MDMA high, euphoria and empathy abounding. I prefer snorting it for whatever reason (snorting is usually the last way I'll do a drug), but love eating it and strongly dislike the high, and ritual, of smoking it. The duration-long effects from shooting it are less desirable to most users, besides the initial rush, because the dose has to be so enormous to give a significant rush. If you know how to smoke it and have a proper pipe, you can nearly reach that rush with a good vaped hit of glass, anyway.
Before I get too far off-track, you're right though, ultimately just depends on what you're into, method or drug. At the end of the day for a user who has used more than a couple times, while ROA can have an impact on how fast one is hooked and ritual can be a sexy factor especially in IV heroin or vaped meth users, it's about the generalized effects of each drug and if you love them or not. Not many addicts are going to say "fuck this shit, I'm going home" if they're not allowed to use their favorite method of ingestion anymore. Would I bother doing heroin if I had to snort or smoke it? No, but I don't love it enough. Although I no longer buy meth and therefore very rarely use (it's been several years), I love it enough to do it any way available.
