Are the Hardest punches delievered from a distance or from close range

Are the Hardest punches delievered from a distance or from close range ? or does it depend on the fighter and there physical attributes etc ,ive always been under the impression that the shorter punches are the harder punches because they have more body behind them but ,IMO that depends on other factors like height and reach etc i mean i would say its easier to generate power inside if u have the shorter arms as apose to being very tall and having the longer arms which usually makes it more difficult to work inside let alone find power on the inside Fighters who hit hard from a distance Gerald McClellan, Thomas Hearns ,Kermit Cintron ,Chris Eubank i know Eubank was not a huge puncher but he hit a quite hard dig from a distance with his right hand he had Steve Collins down ,he had Malinga down ,which Benn could'nt do & I Also thought he had Joe Calzaghe going in the last few seconds of thier fight aswell , he had Carl Thopson rocking aswell a full blown Crusierweight ,i dont consider him a big puncher just explaining why i think he had good power from a distance etc Fighters who were more devestating in close Nigel Benn ,Mike Tyson, im sure if missed plenty of names out but i dont wanna bicker over the names i have chosen ,so if u think someone who should be included who is relative to the discussion please include by all means