McCall is a weird one, he definitely isn't getting knocked out by Tua and has the tools to win, but he'll probably let too many rounds drift by and get outworked in a decision loss
Also, Tua may be fat, but when he was motivated and in shape he could throw and throw and throw. Don't forget the Ibeabuchi fight. I pick the best Tua to outwork the best McCall straight up.
Yeah, a prime in shape(ish) Tua had a surprising workrate, he wasn't always just a plodding left hooker.
McCall was the more talented fighter imo, he just had a sparring partner mentality. People go on about his chin (the best chin ever I would say) but his defensive skills were very, very good. He just didn't throw enough and spent half the time posing.