You're assumed a drug addict until proven innocent by the medical system (including pharmacy). They shouldn't ask what meds you want, you're not a doctor, that's their job. If you answer that question they again, may assume your a drug addict. If you did research and think a certain med would work best I'd ask questions about it or try to steer the conversation that way.

Be prepared to defend your disability again, write down the reasons you think you have ADHD and/or need meds to help you do that.

Just remember you're paying them to do a job. Not all of them are great at their job. Sadly you might have to shop around till you find someone good at their job. Just go into default answer mode, if you catch wind they're not going to be in any way helpful for you. It's sad that they are the ones who decided this is the medication or treatment for this particular disorder, and then if you ask for the medication they've deemed necessary, some get a power trip on demonising you for it. If all else fails, Ask a bazillion questions, like you know nothing, you can't have preconceptions, if you have no idea about anything? Maybe? Trust. You know what's up. You know what's right and wrong. Don't let them intimate you, just get outta there if they start messing with you. Save your sanity. Keep at it. You'll find someone.

You will most likely have a process of trying out different medications to find what works best for you. If you have concerns, like a family history of addiction, it is probably worth bringing up in that process. I will say that because the stimulants, at least in US, are a controlled substance getting them requires jumping through more hoops. So that is also something to include in the conversation.

Determining what medicine to start with is a very active research topic. If you're very hyperactive, perhaps stimulants are the way to go. If attention deficit is the dominant factor, perhaps try non stimulants first. They pose a lower risk of addiction and supposedly lesser side effects, but that is very dependent on pacient and specific medicine.

Obligatory I'm not a health professional and this isn't medical advice. Your psychiatrist is the best person to answer these questions.

As David_Eight said, it's not for you to determine what meds to use or start with - the doc will have some ideas where to start based on your symptoms and their impression of you.

They'll probably propose one or two different meds - of you have a concern about one this would be the time to say so. But only from the perspective of your concerns for effectiveness and side effects for you.

Let the doc guide the med discussion - they're the supposed expert, let them do their job.

Edit: didn't mean this to sound harsh, just that patients coming with med ideas trigger the "med seeker" warning light for docs, especially in the ADHD world.

If you focus in the symotoms that concern you, you come across... Sympathetically