I will admit it's close either way though.
He enjoyed more team success at Louisville last year than he would have in his junior year at State. However, he was on the bench the whole year. Would you rather play a significant part on a second round team or ride the pine for an Elite 8 team? I don't know, but considering the widely believed reason he left was due to issues over playing time, I bet he would take the former.
This year, they are in the tournament but unlikely to do anything of note. Assuming they don't make the Sweet Sixteen, then I would argue we had a more successful season last year than they have this year. I'll take an SECT championship with a first round exit over a second round exit with no championship. But again, I admit it's close.
However, he had to sit out a year at UL, but he wouldn't have here. Considering everything else is so similar, I'd say that this is the tipping point. So, no I don't think he made the right decision.
All that said, he could very well be happier in Louisville; I have no idea.
Edited to word something more clearly.