Well, going off the only dog I briefly owned in 1976, I think Gooey knows the one, even though he wasn't even born then, I'd always prefer a bitch. All that sniffing and pissing every few yards, you get with dogs, apparently, plus the always on the lookout for bitches in heat, would probably drive me to distraction!!
From the dogs and bitches I've seen, workwise, probably nothing in it really. As always, some are better than others.
Nah, I think I'd probably prefer bitches.