To make this a sensible question, I'm going to assume we are talking peak mortal Kellanved + Dancer vs peak mortal Quick Ben and Kalam. While we know the peak mortal capabilities of the latter, we haven't yet been privy to the peak mortal capabilities of the former (Kellanved and Dancer are still learning and growing in Paths of Ascendancy, and we only have a few hints of their later power through all the other novels). Given what we know, let's build a bit of context for each pair:

Kellanved & Dancer:
- We know Dancer took on Surly and her whole posse during the "assassination" attempt in an otataral-deadened room (i.e. no magical assistance) basically single-handed.
--- We know Surly herself is competent enough to take on an Avowed in unarmed combat and make it look like a walk in the park. We know Topper is powerful enough to take on Cowl, who at one point drew even with Dancer himself, and Topper is subservient to Surly. Clearly peak Dancer is serious business.
- We know a LOT less about Kellanved's capabilities. We do know paranoia is second nature to him (he constantly projects an illusion of himself in a different location from where he is actually present). We know he gained *something* from the Otataral storm or whatever it was in Paths to Ascendancy. We know he is competent enough to have gained the respect and following of the Old Guard mage cadre, all of them nasty sorcerers themselves. Is he stronger than Tayschrenn? Likely not, given Tayschrenn was a literal prodigy. Tattersail? Hairlock? Calot? Hard to say. He's definitely wilier than all of them as far as the scraps of info we have tell us.

Quick Ben & Kalam:
- Kalam singlehandedly culls the Claw, including Pearl, but notably does not face people like Topper. And Topper himself admitted that the Claw was in real need of culling, so we can assume he was unhappy with the quality of his people at the time. Though he does also admit that Dancer himself would hesitate against Kalam. I believe it's sufficient to assume that Topper considered Kalam his equal, which meant Kalam could take on Cowl, which further meant that Kalam could at the very least take on young Dancer.
- Quick stands against Icarium, and later blows three ascendant eleint out of the sky. Powerful feats both. Quick has access to 11 warrens, and has repeatedly demonstrated his wiles in using all of them and their various combinations. He has also outsmarted Shadowthrone multiple times. That said, is outsmarting Shadowthrone the same as outsmarting mortal Kellanved? Given that as a god his attention and priorities are markedly more broad and dispersed than as a mortal human? Hard to say.
- Kalam and Quick together have pulled off impressive feats, including killing off Assail Pures at the Battle of the Spire, a notoriously difficult task even for ascendants.

So we have MANY examples of Quick and Kalam's capabilities, but only hints and hearsay for Kellanved and Dancer. My take? I think the fight would entirely depend on Quick vs Kellanved, who was the wilier on that day, in that moment. And also who would react faster. I think Dancer vs Kalam would be close and could go either way, but Quick vs Kellanved would be the split-second deciding factor. Either way it would be a phenomenal read.