I have a fixed female. I have had both, but having worked as a vet tech (long ago), I prefer females because I don't have to worry about spraying or bladder blockages. That is definitely not to say that male cats aren't loving.
I had one male that used to entertain himself with this plastic bead. He used to put it in his mouth, spit it out and chase it, then pick it up with his paw and start over again.
My MIL had both dogs and cats and they got along.