for ADHD welbutrin is effective but not very effective, much less than methyphenidate despite having the same action mechanism. One of the reason being that it is a nicotinic receptor antagonist, an awful property, that should be palliated by taking GTS and choline. Also it has less neural occupancy IIRC. Also wellbutrin cause a high? incidence of tinnitus

isopropylphenidate has not been tested, it is reputed to be clean and low potency. It might make sense for stimulant intolerant people since it has low side effects. Otherwise I'd go for low dose 4f-mph or 2-fma, at least if you can't access vyvanse.