I would have to say i prefer girls. The one i have now is a perfect example of why. When im with her, she's completely focused on me, obeys immediately. However, if i have to i can leave her alone and she just sleeps or plays with her toys. She doesn't howl, or bark. My previous dog was a male. He was obedient and loved me. But he was SO velcroey that i couldn't leave him, ever. He'd scream and howl, chew things, destroy anything he could get his teeth in and try to dig his way to china. And yes, i went through all the desensitisation things, and took him to behavourists. It was just the way he was.