Boy cats all the way for me. We had 3 boy cats over the years and none of them sprayed (all indoor cats, maybe that makes a difference? No other scents to spray over??) All cuddle bears. You could pick 'em up, carry them around... Very chilled. My 2 besties all have girl cats and they are all little *****es. Scaddy and scratchy. But maybe that's just coincidence? I reckon more than looking at the gender, look at their personalities. Spend time with them before committing.
Ps: my boy is an awesome hunter. He catches moths mid-air. True story.