fruits often come in different colours. apples, for example. in terms of nutrition, colour typically has the most effect on vegetables. you always seek darker tomatoes and darker brocolli, because the darker it is the more significant it's colour it is, and the more significant it's colour it is, the more the vegetable has been exposed to sunlight and is consequently wealthier in nutritional content because it's able to flourish.
just like pot growers favour the nug closest to the light over the one tucked under a leaf, when it comes to vegetation the one that gets the most solar exposure will be more potent than the paler fruits of the same tree.