Well, for one, we know jack shit about Arcann. So to further limit us by saying "sabers only" makes things super difficult.
That being said, he utterly lolstomped the most powerful being on Korriban (out of literal armies of Sith), so that's very impressive.
We can conclude that, given Arcann is the literal blood of Vitiate and hyped to be head over heals beyond the protag, he's winning this.