I say boys are more affectionate. My boy is my lap dog. He's my shadow. My girls are also loving, but more independent. Depends if you are planning on fixing them. Unfixed boys will mark and lift. While girls will go into heat. Honestly, if you want a lap dog, I'd say go with the boys. Plus they are usually a little cheaper than the girls
Actually my boy and girls follow me, but my boy hangs around my bf a lot instead of the girls.