Both have vitamin C, fiber, and antioxidants. But the yellow nectarine has more beta-carotene (that’s the stuff that turns into vitamin A).
The white nectarine is higher in anthocyanins—the antioxidants that give berries their superpowers. So, which is healthier? Honestly? Eat the one that makes you happy. Your body doesn’t care which shade of nectarine you choose.
Irony alert: people pay a premium for "white nectarines" thinking they’re exotic. But they’re just a different variety, not a luxury item. It’s like paying more for a white chocolate bar because it’s "fancy." (You know who you are.)