I think Vivienne gets underestimated and she could go one on one with Dorian. Dorian grew up with magic and has had it around him ever since but even Solas questioned some of his techniques in some of the game-banter. I don't know how old she is but Vivvy is unquestionably older than Dorian(more in-game context) so their experience may equal or come pretty close to one another.
BUT THAN AGAIN....Dorian knows things Vivienne balks at like Time Magic which makes Dorian more creative and open to new areas so...hard to say.
People mistake her cautious nature as fear, fearing magic would be someone like Bethany or Sera. I always pick Vivienne because she's actually trained, like literally trained like a warrior. The time it takes to cast a spell is all it takes to sever a head in a single swing. Regardless of shape shifting, or necromancy Vivienne isn't treated fair because she's a circle mage and understands responsibility. That's why people underestimate her, it based on bias and popularity. Think about it a spell has to be launched across a field in addition to being aimed properly and focused properly, now think about the quickness of simply impaling someone or cleaving off their head. Playing mage you have to run around the battle field like a chicken so you have time to cast the spell without fucking up. You follow what I'm saying? Plus she's suppose to use ice, so you're gonna hold still one way or another.
Ahhh! True I forgot she had the sword! very very good point!! I followed everything you said and I do agree that it is bias cuz of popularity what with all the Dorian/Iron Bull fans. In truth I usually romance Bull so I don't know too much about the "Adoribull" ship.
And I think we'd both agree that Dorian gets favored also cuz of where he grew up. All very good points!
Dorian. Purely because magic is less feared and thus less limited in Tevinter. I believe Dorian must have been educated in magic ever since he was but a boy, and I mean properly educated. Magic is treasured in the Imperium, it is everything. While Vivienne is extremely talented, I think Dorian has a better understanding of magic and thus a better chance at winning.