I think Tszyu is overrated. Sure he beat Julio Cesar Chavez, but Chavez was 38, and lost to Willie Wise 26-3-4 a year before and was stopped by DeLa Hoya two years before that. I agree with you, Zab Judah is the best Tszyu defeated. Taylor was a much faster boxer. He also had a weak chin, but I''m thinking he takes a decision here.
I still don't see the argument that Taylor had a weak chin. He was only beaten by either decisions or technical stoppages and was never really KO'd. He took helacious punishment from Chavez and had it not been for that last second call by richard steele he would have won that fight. He moved up in weight and beat solid welters in Aron Davis and Glenwood Brown.
This sums up my feeling, as well. Kostya was a good fighter but his management did a stellar job of matchmaking for him.