Depends what you mean by "power", but I'd say it's a close tie. ENTJs are more likely to conquer the world, while ENTPs are more likely to destroy it:
ENTJ: The Evil Overlord
The ENTJ is best characterized by his charisma, his ability to grasp complex situations and to think flexibly and creatively, his keen and active intelligence, and his overwhelming desire to crush the world beneath his boot. ENTJs are naturally outgoing and love the company of other people, particularly minions, henchmen, slaves, and the others they rule with ruthless efficiency.
ENTJs usually die at the hand of secret government agents in a fiery cataclysm that destroys their entire underground fortress. Often, Evil Overlords will have a secret clone whose implanted memories contain all the knowledge and ambition of the original, stored in cryogenic suspension in a safe location. The clone will appear in a sequel.
RECREATION: ENTJs enjoy spending their leisure time in groups, seeking out the company of others with whom they can exchange strategies and ideas, and test their mind control rays. They also enjoy competitive games which challenge them intellectually, such as chess, go, and "tell me where the missiles are or I'll open the piranha cage and the girl dies."
COMPATIBILITY: Ideal companions include ENTPs, whose inventive natures often most useful; and ESTJs, who make excellent henchmen once the neural realignment is complete. ENTJs often employ the services of ISTJs but don't usually make good romantic partners with them. Under no circumstances should an ENTJ ever date an ENFJ; no good can come of it.
Famous ENTJs include Ming the Merciless, John Bigboote, and Charles Montgomery Burns.
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ENTP: The Mad Scientist
The ENTP, like the ENTJ, is charismatic, outgoing, and intelligent. ENTPs are often quick-witted, clever, and genial; they typically display a highly organized, rational cognitive ability which makes them natural scientists and inventors.
ENTPs are creative, complex people who seek to improve their understanding of the natural world, usually by building armoured fifty-story-tall robotic monsters with iron jaws and death-ray eyes, or by creating genetically mutated plagues that spread unstoppably across the land, turning all who are contaminated into mindless zombie drones. They are less likely to want to conquer the world than to destroy it utterly, reducing it to nothing but slag and rubble--though this is often merely a side-effect of their pursuit of knowledge.
RECREATION: ENTPs enjoy recreational activities which challenge them physically and intellectually, such as water skiing and porting Linux to their iPods. They are also fond of collecting gadgets like combination cellphone/PDAs and orbiting arsenals of brain lasers, which they may port Linux to as well.
COMPATIBILITY: ENTPs and ENTJs make natural companions, as the one's unspeakable hunger for power complements the other's unspeakable hunger for knowledge. They do not generally build successful relationships with ESFJs, as ENTPs they are prone to behaving in inconveniently erratic ways, which pisses ESFJs off to no end; and because ENTPs simply do not know how to dress appropriately for formal occasions.
Famous ENTPs include Spencer Silver (the inventor of Post-It Notes), Robert Oppenheimer, and Dr. Jekyll.
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