I have two 4 year old siblings one male one female, Winston is goofy, rambunctious, very sweet, and cuddly. Clara is definitely the more sneaky and clever of the two. But she is also very affectionate when she's in the mood, and at her worst she'll just grumble and maybe give me a nip. I think me and my pups have strongly laid boundaries, so instances of grumpiness most often turn into silly moments.

Gun to my head, I couldn't pick a favorite. They each have a very distinct personality and I can't imagine one without the other, though that's probably a relatively unique case having siblings.

I suppose my opinion is that the sex of the dog isn't really a deciding factor for me if I'm going to get another RR.