I have chosen both saving the chargers and letting them die and after some thought I think I'd rather stick with saving them.
Don't get me wrong, I hardly use Iron Bull at all and have little care for Krem or the group really.
I know I'm missing out on such a good staff schematic but on the basis of role play this is the reason why.
Back in DA:O it is pretty much fact that the Qunari ARE GOING to try invade. No questions about it and we get another confirmation of that in DA 2. Even Sten says to the hero of Ferelden that he hopes they don't meet in the battle to come hinting at the inevitable attempt of the Qunari trying to take over the world (lol sounds funny).
On that basis I already know for a fact that this "alliance" is nothing more than a convenience to them and for a group that goes on about honour in battle and blah blah blah, everybody knows they'd be the first to betray an alliance at the drop of a hat.
For me, I have no time for people who I already KNOW have no concept of loyalty outside their own and so in the long run they really serve no real purpose to the inquisition.
Another separate reason:
Don't the Qunari come across a little ... anti-women?
Like they can't separate gender from roles.
I don't know the story of the Qunari outside the DA games but I remember hearing something about how if a woman fights she is no longer considered a woman in the Qunari but is seen as a man because only 'men' fight...
If that is the case, then sorry but I have no interest in allying with a group that archaic in mindset.
I'm not a woman or particularly feminist but even I know that's a stupid mindset.