The only one we have with a distinct preference is Saoirse the wild caught. We were warned that since she once was out there hunting and would likely have never seen an albino prey item that it might be a problem. She will only react to darker colored rats....put an albino in and she totally ignores it....replace that rat with a black hooded or black berkshire and Saoirse will eat (when she's not on winter fast that is).
~~Jo~~