I think it really depends on which stage of their careers we're talking about. I might be inclined to picking Spinks to beat a smaller less experienced version of Holyfield during his cruiserwieght days. Although Jinx never fought at 185 Lbs, he performed well both above and below those perameters, and a young Holyfield might have fell short on the score cards against a more seasoned and awkward Spinks. At the heavyweight ranks however, I'd make Evander a huge favorite. Holy had the right tools to battle out with the big men, and by the time had been fighting in the division for two years and taking on James Douglas, he was in the midst of his prime. Spinks gets stopped in the mid rounds by this particular rendering of the real deal.
I think that Spinks might just have Holyfields number stylisticaly. I will make a bold prediction that Spinks wins by decision but I know that I could end up looking silly.
I didn't think Spinks was particularly fast. In fact I'd say Holyfield was clearly the faster of the two, even though neither were speed demons.