A one punch ko guy like say a Hearns,Jackson or a Hard wear you down puncher like a Julio Ceaser Chavez,Cotto.
One-punch id say. You could be dominated for 10 rounds then land that one shot that wins you the fight.
1 Punchers put asses in the seats and make lots of money, I'd go with the 1 puncher. But as far as a boxing fan or what I'd rather see myself...Either or...
1 punch. More spectacular and no matter how the fight is going you could swing it with that one big punch.