WriterDan's comment got me thinking....When I imagine a fight like this going down (obviously hypothetically since there's no way an Elantrian and a Dakhor monk are actually going to cooperate...), I think of it as the unspecialized people that we read about in the books. So Vin wouldn't be the mistborn. Nor would Elend. I image it would be someone a little less powerful than Kelsier. The Feruchemist very well could be Sazed. My main thing with the Feruchemist is that he would have to have some large stores of strength, speed, weight, and healing (healing, since the others have different ways to make them stronger in the healing department). The Elantrian wouldn't be Raoden, but it would probably be someone similar. Someone who knows the Aons, and can draw them fairly quickly....And the monk definitely wouldn't be Dilaf.
And as for the AonDor not being for fighting....I kind of disagree. That may not be the main use for it, but it can obviously be used pretty well in fighting, even against a speedy opponent. I'm judging it off the fight on the Teod docks, where the Elantrians took out a good majority of the monks--who it had already been proven are very hard to kill. And that was just with one Aon.
But I do agree that it depends on the kind of fight. An ambush? Or close quarters? In an ambush, I'm pretty sure the ambusher would win, regardless of which side. Close quarters, though, would be a little harder, and this is where I think Elantris would win. Like Loud said, it's hard to kill an Elantrian with physical force. Not impossible, but hard. Same with the monks. You'd have to hit them in just the right spot(s) for it to count. And as much as pewter would help the mistborn, one Fire (Ehe) or Energy (Daa) Aon and it won't matter.