The J7 is the higher-end model, though it's still not especially powerful. When compared with the J3, it has a bigger display (but it's still 720p), an extra 16GB of storage, better cameras, and a larger battery.
5.5" 720p TFT
13MP rear, 13MP front
Android 8.0 Oreo
As with the J3, the names and prices can get muddled up, so here they are in bulleted form: