Methylphenidates can be quite numbing (zombifying) in my group of ADHD friends but dex seems to have a more consistenly helpful effect. The unfortunate caveat for me is that I personally seem predisposed to pelvic floor/urinary issues, which you'll find anecdotal evidence of being exacerbated by amphetamines (research seems yet to catch up), but aside from that the theraputic effects, particularly in emotional regulation seem so far unmatched.
It's unfortunate we have such a tentative model of how our body and, particularly, our minds work so drug treatments often require a trial and error process.