Fat Franks hold up well - they are already a little bit yellow and because of the tread design, only the raised parts of the tire get dirty - it gives it a well used look
the felt tires, while i think they look the coolest tend to yellow very badly and do not hold up well
i had some 700s on my road bike made by maxxis, that were creme and gumwall - they held up well but they cracked easily.
now i have vintage michelin 700s on the road bike and they are nice pure white, but get dirty very easy - but easily cleanable
i also have some electra diamond tread white/cream tires that i havent run yet, but ive noticed them getting ever so slightly yellow just hanging on the wall....
hope this helped.