(Like the other commenters, I didn't ever see a choice for the e-book page color. Only print.)
I chose white because the cream pages in the books I had laying around looked ... kinda dirty to me. But maybe they were older books.
My critique group mostly recommended I choose cream.
Someone said if my book was a 'beach read,' cream would be the right choice because of the glare from the sun. That actually made sense (but to be clear, I didn't write a beach read.). Anyway I went with white. I wanted the crisp feel of white.
It will also impact the thickness of your book. Cream pages are heavier (through amazon, anyway). I think. So if you want a thicker book, cream can help. A friend of mine has a humorous list started of how to make a 40,000 word book look like it's closer to 70,000. Cream pages is one suggestion of many that he has pulled together. It's a funny tongue in cheek list.
But also, your cover for print will either fit the formatting for white or cream but not both.