PaulH said:
Harry Potter.
Wizards trump fighters. Though Vegeta is more a Warblade. Once again, it all comes down to initiative and preparation. Does Hermione have her Time Turner? Also, you know. Petrification + Death spell. The Harry Potter crew are infinitely smarter with their magical Mcguffins than the DBZ crew, also.
You have the power of dragonballs and they consistently fuck up their wishes.
Plus Harry Potter universe has a better time travel mechanic ... 'better' being no multiverse stuff you have to worry about.
Not only that, but EVERY Character that is a non-muggle is capable of reality tearing magic. DBZ you have a handful of characters are capable of instantly killing people. Not only that, but divination magic. In any realistic sort of scenario, divination shits all over any pure power-based magics.
"Where is Vegeta going to be in 3 minutes time?" >>> Portal Key, Broomstick, time turner, pop out of nowhere Petification + Death Spell.
Not only that but you can have INFINITE number of Potters. The Time turner allows you to go back in time to where you are ... so you can have an infinite number of Harries (to pluralise) and therefore truly unkillable in combination of divination magic.
Divine Vegeta killing Harry, at that time have a billion Harries.
That is not how time travel works in Harry Potter, while the mechanics are vague, they explicitly state that bad shit happens if you meet yourself while time traveling, I think the Pottermore stuff elaborates that you basically end up getting ***** slapped by the universe if you try that shit. Even if it did work that way, why is Harry being able to copy himself a billion times at all helpful against a character that even at his introduction could blow up a planet from space.
Not to mention, the death spell thing is not homing, nor does it seem to be exceptionally long range, it can also be blocked by any non-living physical object, you can block the Avada Kadavra by throwing a chair in front of it. Disregarding the fact that DBZ characters can move fast enough that normal humans can't even see them, and wizards are not shown with any abilities to slow down time or move faster than normal beyond teleportation which is shown as disorienting and not something really used in the heat of battle. They also can engage in energy battles from miles away, and can sense energy, so we don't even know if a wizard can sneak up on someone like that, we would first have to establish how magic and ki interact with each other. Even if a death spell works on a DBZ character, the show established that it is entirely possible to come back from the dead without even getting your body back, you can literally come back to earth as a spirit and still blow shit up.
Also, divination does not work that way in Harry Potter, as the classes with Trelawney show, divination is about vague prophecies and cryptic events, there is nothing displayed in canon Harry Potter that would reveal something like, "vegeta comes to kill Harry Potter in 3 days", even a prophecy given by Trelawney is vague as hell and doesn't actually indicate who will be responsible for defeating Voldemort, which is why Voldemort went after both Harry's and Neville's family.
Despite all that quibbling, whoever wins is going to depend on the setup, does harry get to use literally any magical object from the books? Even if he has no experience with it? Does that mean Vegeta gets any item from DBZ? What's the circumstances of the fight? If they both know about the fight in advance, what is going to stop Vegeta from just flying into space and destroying the planet? Whoever wins is whoever the writer wants to win, you can write any number of scenarios where either character wins, it's going to depend on the setup and how you write magic interacting with ki and DBZ characters.