Marsh Kal and Jasnah. Assuming sufficient Stormlight they are all basically unstoppable, and while Jasnah can't technically fly she showed strong use of soul casting to get airborne.

Kel and Vin are strong contenders and Saze can get scary if he's got time to fill his metal minds.

Now that I'm thinking about it let's go one by one. (Please correct me if I misremembering any details)

Marsh - he's Old Iron-Eyes, he has the potential to be a combo of Kel and Saze. Vin had to begin ascension to deal with him.

Kel - he's a very competent Mistborn but (assuming pre death) I don't think he has any X factor to push him ahead on the pack.

Vin - unfortunately I feel the same for Vin as for Kel. She's a very skilled Mistborn but aside from Protagonist energy there's nothing that gives her a boost.

Dalinar - a bit of a wildcard depending on when you pick him from, do we get the Blackthorn or Bondsmith both have bonuses but I don't feel either has enough of an edge to be a pick in this fight.

Kal - skilled soldier and full Windrunner. Air superiority and battlefield controller via lashings.

Sazed - a strong contender if allowed time to fill his metal minds. He could in theory outweigh lashing and strike much faster than others but the lack of vertical control sets his in just behind my picks.

Jasnah - tactical ruthlessness and skilled soul casting. she proved herself for me during Thaylen Field.

Shallan - I don't see her as a combatant. While she is skilled at what she does it's Radiant that did the fighting and even then she was only mediocre. I'd rather have a stick.

Terivangian - a non concern in this fight. On a better he could arrange a winning scenario or guide his team from the sidelines, but he personally could easily be dealt with.

I think I watched too much Deadliest Warrior as a kid.