Zhang vs. Rose is interesting, and depends a lot on how Zhang chooses to fight. If she tries to play a technical outside striking game like she did against Torres and allows Rose to fight at her pace, she'll get badly outpointed and lose a decision. She has not shown the technical skills to hang with Rose's speed, footwork, and setups. If she uses an aggressive pressure game she can melt Rose and finish her sometime in the 2nd half of the fight. Put the pressure on Rose and she always gets melted sooner or later.
As for who did better against Torres, it's close enough that it doesn't mean anything. Zhang & Joanna were both in solid control against Torres. It's not like one of them squeaked out a decision while the other 30-24'd her.