IMO I rate them both highly eaqual, but if I someone was to put a pistol to my skull...I would chose the 12 round boxing clinic...It takes skills for you to totally outclass an pro-fighter the way Calzaghe did Lacy.
Boxing lesson, because eventually you are going to meet someone who takes your best shots and keeps coming, someone you can't starch in 2 rounds.
Oh yes the best way to win is the short and sweet, you are there to get the job done with minimum risk and fuss.
Short and sweet because you got the knockout. It takes skills to win any boxing match. Who says Hatton wasn't outclassed?
Anyone with a decent punch can get a KO (albeit lucky) but not everyone can put on a clinic. A master craftsman in action is far more impressive.
Short and sweet is always the best way but a 12 round clinic is just as good so i dont feel cheated when i get the Pay-Per-View bill.