Were I a betting man, I'd put my money with the Bladesinger. As the most martial and least magic dependent of the wizard subclasses, it should have a decisive advantage over the others should they choose to cast antimagic field on themselves as their concentration spell prior to initiative. "No magic allowed" is probably the absolute hardest of hard counters available to any wizard in this fight, after all.
I'm pretty sure abjurers are pacifists. So they'd lose. Transmuter for the win - he'd just turn into the terrasque and squash his opponent.
The illusionist sends a decoy in his place and goes to the pub. The diviner sees it coming and cuts out to meet him there...
... The conjurer summons a host of celestials/fiends/elementals to the fight, and goes to the pub...
(Insert next wizard type and excuse to go to the pub)
Cheers, Al'Kelhar
Divination. They saw the fight coming and prepared accordingly.
I thought about this too, but I'm not sure how Antimagic field interacts with ALL of the other features that the other wizards have.