It's really up to you. I raise NZs now, but have raised both other breeds and have found that the lines you are buying from matter far more than what breed. If you want good temperaments in your breeding stock, make sure the person you're buying from raises rabbits with good temperaments. If you want fast growth rates, or parenting, or whatever specifications, make sure you meet the stock and see as many records as the breeder will show you.So should I go with NZ White, Californian or Rex