1 medium Grapefruit -- 17.86
1 medium Orange -- 12.25
1 medium Tangelo -- 8.88
1 medium Tangerine -- 7.47

4 oz. Tangelo -- 8.60
4 oz. Orange -- 7.85
4 oz. Tangerine -- 7.11
4 oz. Grapefruit -- 3.90

Prune Juice -- 42.11
Grape Juice -- 37.60
Papaya Juice -- 34.36
Passionfruit Juice -- 34.15
Pineapple Juice -- 33.95
Cranberry Juice -- 31.88
Apple Juice -- 28.72
Orange Juice -- 26.56
Tangerine Juice -- 24.46
Grapefruit Juice -- 21.88
Lime Juice -- 21.18
Lemon Juice -- 20.08
Blackberry Juice -- 19.25
Strawberry Juice -- 16.35
Watermelon Juice -- 15.90
Tomato Juice -- 9.31

Carrot Juice -- 20.03 (1.89 Fiber)
Celery Juice -- 5.68g (3.78 Fiber)

Fruit for Fruit, Tangerines and Tangelos would be the best choice. Ounce for Ounce, Grapefruit would be the best.

As for Juices, most are very high in Sugar...though Tomato Juice [typically considered a Vegetable, but really a Fruit] is pretty low as is Celery Juice [which is a Vegetable.] Lemon and Lime Juices are high, but can successfully be added in very small amounts [with a non-caloric sweetener] to water...to produce a drink that is low in carbs, yet has a Lemon and/or Lime taste.

It is possible to reduce or even eliminate most of the sugar in Fruit Juice. There are a number of Reduced Sugar Juices already out there. If the Orange industry is incapable of comprehending this, then they obviously don't have the sense to run a business properly.

BTW, all my numbers for Juices are based on the Juice itself. If you add extra sugar [as is often done,] the amount goes through the roof. Even back in my Low-Calorie [Low-Fat] days, I wouldn't touch Orange Juice because the stuff was so damn high in Calories [for a Drink.] For reference, Orange Juice has 1/3 more Calories than Soda. I would have been better off Calorically speaking, drinking a Coke.