A combination of blistering speed and length will probably generate more whip and suprise shock and likely to catch your man cleaner for better looking 1 punch ko's - thats hearns. If you can see the punch coming and then you can defend it better your less likely to get Ko'd but still breaking your man down with every punch and making him not want to exchange, because every punch is brutal - thats golovkin.
Pound-for-pound, it's gotta be Hearns. At 160, GGG takes it. Cliche, but: whatever he hits, he destroys.
Hearns has that 'put your lights out with a shot' power. Golovkin has that 'every punch will shave years off of your life' kind of power.
I love "the oldtimers " such as tommy Hearns for his power and depth of opposition. that being said, in GGG we just may have an all time great MW destroyer in Golovkin... His sheer "hurt" he inflicts on his opponents wherever he hits them seems awesome to me...If I can think of one fighter of the past that was known for the same placement and power to dissolve an opponent, it would be old Fitz, who John L Sullivan aptly described Fitz as a "fighting machine on stilts"...With GGG time will tell...
Chris, it is so hard to compare GGG with Monzon who proved himself, whilst GGG hasn't yet had the opportunity or opponents to do so. But my intuition tells me Golovkin though still untested thoroughly has the potential to be one of the great MWs we have seen in years and years. He hurts an opponent wherever he lands on them with seemingly very little effort. I have not seen that before [maybe Kovalev], and it is said that in over 300 amateur bouts, and his 25 or so pro bouts, GGG has never been floored...Very, very special is GGG I firmly believe...
Hard to say, both guys are tremendous punchers. GGG has the Sonny Liston ability to knock people out with his jab.