The tiny oranges that are sold in stores under the name Cuties are called Clementines.
The Clementines which are the small oranges are seedless oranges and have a taste similar to tangerines.
Clementines are also smaller than larger oranges and the Clementines are also sweeter with a thinner skin that's generally easier to peel than the skin on larger oranges.
If you want a sweeter tasting orange then going for the Clementines would be best because both oranges and Clementines have a great source of Vitamin C and nutrients.
So although it's best to eat both Oranges and Clementines as long as you eat at least once variety of the Oranges you'll still have improved health.