I'd say the Nuke. I'd like to specifically point out that the H-Bomb, using a bit of Fusion technology, better explained as a thermonuclear bomb, beats the rest of the nukes like Little Boy and Fat Man that worked only with enriched plutonium and uranium, the H-bomb was uses the same principles to build heat and pressure into a fission core, that builds heat and more pressure, that goes boom. It goes boom a lot more -- just hasn't been tested yet.
But yeah really what a pointless tppic.
But to get creative, if you could cause a seismic wave that would produce an earthquake -- THAT would beat a Nuke. You'd kill more people, damage infrastructure, and, in some cases, if there are Nuclear Reactors there, you'd practically due a Nuke + Extra damage!