Ok let's see Itachi would either go blind or die from his disease (i am sure team a can hod their ground longer than sasuke), you said that it is Nagato who is fighting, and even with his almighty Rinnegan he is still crippled, And besides edo tensei (which he couldn't actually use in this fight because it would be overkill, and also he wouldn't have time to perform it... the whole sacrifice and that) Kabuto hasn't shown any abilities yet so it is hard to guess. Madara... well nothing to say about him... sharingan (and count it as a regular sharingan, he hasn't shown MS or EMS so far so don't assume he still has it) and rinnegan.
Well if Jyraia manages to go sage mode, summon the 2 frogs and have them cast the genjutsu than it is all over.
Also since they are fighting in a group team A is kinda immune to genjutsu... even if they were to be caught in one, a teammate would wake them up... and also killer B is immune due to him being a perfect host.
The only thing that comes to my mind right now, for team B to win fast would be Chibaku Tensei, i really don't see how team A would handle that... well maybe Minato could teleport everyone away... maybe.
So in the end it is a hard choice and again you are putting characters up there which we have no idea about their powers, fighting styles and many other things...