The ninja would spend time studying their opponent, learning their weaknesses, and finding a means to exploit them. The wizard would spend time studying the universe, learning its weaknesses, and finding a means to exploit them.
I'd say that the ninja would win, but it would be a Pyrrhic victory - the ninja manages to kill the wizard, but dies from injuries soon afterward.
That's assuming that the ninja doesn't just waste the wizard before he sees anything coming, though. If that doesn't happen, the wizard will fry the ninja unless his magic isn't practical for one-on-one combat.
The future of warfare in UC.
This is a classic skill vs. power setup. Beyond that, any discussion without further detail of actual combatants is useless.
Nous restons ici.
Banned, selectively
I don't know that it is useless, but all proper answers would start with "it depends" and then the meat of the answers would be to explore what it would depend on.
Whether you think you can, or you think you can't, you are probably right.
I guess it depends on the terrain and whether the Wiz's elemental powers allow for some sort of super-detection power. In an open field with the wiz detecting air currents or heat signatures or bioelectrics or heartbeats or whatever, it gets rather Pythonesque: The ninja is hiding in one of these bushes. KABOOM.
In close quarters where none of this is happening, the wiz would enjoy a lethal steel enema.
Whether you think you can, or you think you can't, you are probably right.