Prefer Girl or Boy Rats?

I had a girl hamster, and a boy hamster. The girl was really adventures, , like you said, and was always on the move all night. She wasn't the nicest one in the world but I still loved her since. She was my first pet. After she died, I got a boy hamster, and this one was really lazy, cute, and furry. He slept most of the day, and when he woke up, he went straight for his wheel and ran really fast all night long. Then he slept again :p I prefer boy hamsters because they seem friendlier then girls in my experience.