The resurrected females seem more vicious...

...than the resurrected males. In the first movie, when Timmy Baterman comes back he's disgusting and horrible but he doesn't kill anyone (at least right away, later on he dragged his dad back into the burning house) and Gage seemed more vicious, but he plotted and planned and didn't kill his father right away when he took the surgical instrument out of his bag. But when Rachel comes back she kills Louis right away, no hesitation.
In PS2 when Gus comes back, he's goofy and weird at first and gradually comes more violent, but doesn't kill anyone right away. I guess that bully that came back was an exception. When Renee came back, she killed the housekeeper Marjorie without hesitation and later set the fire to the attic and removed the doorknobs.