Weighting would be equal for both since both are hollowed out and ballast can be easily adjusted to eliminate that as a difference.
Very well, if weight is not a factor, then I will default to uniqueness and rarity. My vote goes to number 1.
I like option 1. I might not have been into this hobby for very long, however every vintage barbershop style handle I have seen it two toned, as far as I can recall. Why knot reknot a one tone and have something rare.
If it were me, I'd choose handle #1. It looks lovely. Well balanced with the knot. Though handle #2 isn't half bad, #1 seems to me the perfect combination. Ether way, you'll have a great addition to your brush collection!