Just to make sure I am being balanced here is an double-blinded cross-over design study comparing methylphenidate (Ritalin) with atomoxetine (Strattera). This is a good study design but the number of subjects was very small (only 9). This may be why there was no significant difference found. Also this study measured the effect on the brain, and not on the subjects' actual symptoms. So unless you are interested in brain neurophysiology you might want to skip this link.

I needed a double does of my Adderall to get through this one :-)

Comparison of the inhibitory and excitatory effects of ADHD Medications Methylphenidate and Atomoxetine on Motor Cortex