Its like comparing Tiger Woods to Bobby Jones. Who is the better golfer?
Yet you did choose one over the other. I'm just curious as to why as I would have ranked Forrest over Stuart. By my way of thinking Forrest proved himself the superior in independent command while at the same time fulfilling the role of a cavalry commander on those occasions when he was attached to an army. Stuart proved an able commander in the traditional role of cavalry, showed he could take over a major command as when he took over Jackson's corps for a short period at the end of Chancellorsville, but also came up wanting when Lee really needed him as at Gettysburg.