When picking out oranges in the grocery store, go for the soft, almost beat up ones. The softer, off color, less orange looking oranges are the BEST. They are juicier and delicious. I used to pick the hard, bright orange ones. They were good, although sometimes dryer.
My ladies son told me about this so I tried it. He was right! They peel easier too. Basically, the softer and uglier the orange is, the juicier and better tasting it is. Enjoy!