I don't think it will matter - just look for a personality that matches yours.
I didn't think I would be able to deal with narsty male dog behavior, but it's totally different when it's your dog. I even think Thor is cute when he's pooping. Okay, I'm not thrilled when he gets hot and bothered, but really, yorkies are so small and fun, it's no biggie (both literally and figuratively, ha ha).