I think babyboos pretty much covered it - I don't think theres too much difference between Campbells and Winter Whites as pets, there is a considerable difference in keeping Robs though. Like morag said Campbells sometimes have a bad rep for being biters, which can be true with individuals but with the right handling and management can be got around if it is a problem. There are more colour variations widely available with Campbells too. I think WWs are prettier but that's a personal thing
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