The two types of orange are very good but Navel orange don't have seed and Valencia orange do have seeds and from their sharpness you can also know the difference so check the pictures in attachment below and read more on the details I have provided.
Navel oranges (the "winter" orange) and Valencia oranges (the "summer" orange) are similar in flavor and appearance, but what distinguishes one from the other? Oranges are one of the most commonly grown fruits in the world, and both Valencias and navels are categorized as “sweet oranges” of the genus Citrus x sinensis. From the outside, the main distinguishing characteristic that can help you tell them apart is the feature that gives navel oranges their name.
The navel orange actually grows a second “twin” fruit opposite its stem. The second fruit remains underdeveloped, but from the outside, it looks like a human navel—hence the name. Navels are part of the winter citrus family. They’re seedless, peel easily, and are thought to be one of the world’s best-tasting oranges.
The Valencia orange (typically available starting in March and continuing through September or so) is so named for the city of Valencia in Spain, although the variety is thought to have originated in China or India. Valued for their high juice content and availability outside of the typical citrus season, Valencia oranges are usually thin-skinned and have a few seeds. They are considered one of the best oranges for juicing.
