There may not be any RR owners frequenting this forum, but the question you're asking is not necessarily breed specific. Deciding on a male or female mostly depends on the current dogs in your household, it is usually a good idea not to get two dogs of the same gender if you can help it. RR do tend to lean on the aggressive side of the spectrum which means SSA in males may be an issue.
Do you have any current dogs?
Do you have any current dogs?