Both options are likely to happen, just like many other scenarios.
I just don't see one of them coming out more likely than the other, thus I consider their chances to win equal.
It possible that would be not Incon due to skills of street fighter verse. (Skill Outplay & Equal Speed)
Zavika can destroy her one arm weapon so If Vi meet Dudley who Gill also respect him
Her weapons would be useless like when Balrog lose to Dudley (Power lose to skill)
SF5 Balrog became Dudley No.2 in his own sty (Improve) after He lose to dudley in SF4
And yet still cant punch Mika down in SF5 and Poision should can fight R.mika perfectly
She can fight Cody & abigail Rolento that mean Poision is One of the OG fighter.
She will out smart and intercept every move vi made (in Equal speed)
She can even Provoke Vi too. (Vi had Temper so easy)
Vi lack of experiend to scale in her verse (No skill fighter in Arcance yet)
Zavika rely on Boost and Blade cant compare to Dudley or SF5 Balrog
Poison can scale to r.mika who fight sf5 balrog that Improve.
Posion should had more chance to win due to her skill scaling
Vi lose to Dudley 100% even Equal speed like SF4 Balrog did
Vi & Balrog was Base from Mike tyson even personality
Balrog was change a lot after losing to dudley but still cant one punch R.mika
R.mika fight posion (posion should defeat R.mika while Balrog cant beat R.mika yet)
The weapon hextech & barrier stuff would be similar to hadouken & other power stuffs in the verse.
but Vi had Limit in Using those power if Posion can avoid them like those street fighters in her verse.
Posion would smile instead because she seen those kind of power before.