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Well, that is a tricky question to answer. A black hole can be produced from a supernova. A supernova is an implosion and explosion, but a back hole is a wormhole or well that is an opening into the underlying part of the fabric of space. While a supernova does not last long, a black hole may last indefinitely. It is not the hole that is powerful, but the pull of gravity from within the hole. The force of gravity within black holes and a supernova have opposite effects of power. Supernovas explode but black holes are the result of the implosion, with resulting rupture in the fabric of space linking it with the underlying region of gravity itself.

The black hole and the supernova wouldn't be very close, only a few thousand/million feet away, so most of the star's energy would go into the black hole. If the star turned into a black hole there would be an epic battle, but the older black hole would actually win because it would have a bigger gravitational pull. Though if the older black hole was smaller the bigger of the two black holes would win. They would spin around each other and then combine after a huge battle. This would create one huge black hole that has epic power and gravitational pull.

A large percentage of stars are more powerful (luminous) than our meager Sun. The only known "object" emitting more power than a Supernova would be a Quasar, which is POWERED by a super massive black hole but also involves lots a matter falling toward that black hole.

ok really they are almost the same thing but in different form. a super nova is the thing that happens right before a black hole is formed.but a supernova expurst and can destroy anything in that solar system and even more depending on the size of the star.a black hole can suck anything in it,even light itself and will rip it to shreds.so in different ways the black hole loses and the nova wins and the nova loses"most of the time"and the black hole wins but in gravity...the black hole will always win.in explosion the super nova aways wins because black holes dont explode. all super novas do is destroy the planets in that solar system and can be seen thousands of lightyears away"of course it would take that much time to get there"but a black hole can and is swallowing an entire galaxy. from my sources there is more black holes in each galxay then probably stars!so the black hole most likley.

In order to answer this question, you need to define what you mean by powerful. A supernova puts about 10^51 ergs of energy; a black hole doesn't emit any, but it can absorb more than that easily by pulling in a star. A supernova emits far more energy than our Sun; our Sun is a small star, bigger than average but there are still many stars many times bigger than our Sun.

In terms of galactic superpowers, our sun is really rather rubbish. Only recently Europe's very large telescope assembly in south america has discovered a blue star hundreds of times the size of ours.

I would say a black hole is more powerful basically because nothing can escape it, not even light.

why the hole gotta be black ?

i say a supernova

My money is on the hole.