Geralt wins. He has nearly the same powers, but is probably a better fighter. He could just make the dragon born not want to fight with axii and then lop his head off.
Alternatively, the Dovahkiin uses Gol Hah Dov to bend Geralt's will to his and then cuts his head off.
Or he uses his Thu'um to shout him apart.
The Dovahkiin could probably solo the Witcher series. He's far more powerful.
An average Master of the Voice can break through a city wall in a siege with a shout. Miraak, whom the Dovahkiin bested, could sunder Solstheim from Skyrim's mainland with his Thu'um.
No, Ulfric said that shouting the old king apart was exaggerated, he merely forced him down before running him through.
Ulfric however was not a Master of the Voice. You can argue that Miraak and Vahlok ripping a landmass from a country is exaggerated, but it is well verified that an actual Master of the Voice can destroy fortress walls with a shout. Tiber Septim also literally altered the climate and landscape of Cyrodiil, and the Dovahkiin should have at least a comparable Thu'um, since his Thu'um is on par with Miraak (first and possibly mightiest Dovahkiin) and Alduin's.
I shout at the walls all day, and never damage them.
__________________ What CDTM believes;
Never let anyone else define you. Don't be a jerk just to be a jerk, but if you are expressing your true inner feelings and beliefs, or at least trying to express that inner child, and everyone gets pissed off about it, never NEVER apologize for it. Let them think what they want, let them define you in their narrow little minds while they suppress every last piece of them just to keep a friend that never liked them for themselves in the first place.
I'm not familiar with this Witcher character but the Dragonborn is one bad a** S-o-B especially when he's close to like level 90 as mine was in my last game.
I was shit-stomping literally everything I came across (usually one-shotting them) even that Ebony Warrior dude who lasted only like ten seconds at most against my Dragonborn character.
Even w/out some of the overpowered shouts he had at his disposal, he was like a force of nature.
__________________ Paleontologists have tried to turn Archaeopteryx into an earth bound feathered dinosaur. But it is not. It is a bird, a perching bird. And no amount of 'paleobabble' is going to change that.-- Alan Feduccia-a world authority on birds, quoted in "Archaeopteryx:Early Bird Catches a Can of Worms," Science 1994, p.764-765
Dragonborn wins because he constantly summon Daedrics, Atronachs, almost anything and they even have a maxed out skill tree 0.o. Might even be a Brenton.