ZTS—I'll probably wait a few days before buying, which allows more time for the requisite DD on valuation.
I do think the animal-heath drug business—for both food animals and pets—is a major beneficiary of The Global Demographic Tailwind, so I will likely want to own ZTS if the valuation is not excessive.
In the meantime, if you or anyone else has an educated opinion on the valuation, please chime in!