Adopting kitten; what gender?

We have an old male Siberian cat (10y) and a 4y old löwchen female dog. We’re getting a new kitten. Which gender would you chose? Our dog LOVES the cat, but the cat is getting old. The cat has a cat door and can roam the house freely;) The dog needs a playful partner, so she don’t need so much attention from the old cat.

The woman at the rescue centre said a male kitten might challenge our old man to get his place in the hierarchy, and she would choose a female because they rank top, naturally.

I like male cats best, mostly because females often have more predator instincts, and neutered males are often cuddlier and calm. But this time we also want to find a cat that matches our dog?!?

Which gender would you choose? What is your experience?!