Best and actually healthy juices?

Any premade juice you buy is going to be preserved in some way. Not possible get "fresh" fruit juice unless you make it yourself. Some of them 100% fruit juice, while others contain added sugar. V8 is pretty good with no artificial ingredients, or added sugar (in almost all of their products I believe) just read the labels to make sure it fits into your calorie goals. Fruit juices are going to be naturally high in sugar.

That being said, you do not need juice to "supercharge" your diet. Sure they taste great and can provide nutrients, but are not needed/won't boost your weight loss.

Eta-I personally prefer to eat fruit rather drink fruit juice. Keeps me full longer. I could drink several hundred calories in juice and still be hungry, whereas with the actual fruit, the fiber keeps me full.

"Healthy juices" are just marketing ploys. They're convenience items that have latched onto the "health foods" fad. Seriously. If you want juice buy 100% fruit/vegetable juices in the large bottles and pour out what you want.

Additionally, don't make the mistake of believing that you have to drink juices in order to somehow "supercharge" your diet. It doesn't work like that. Eat a balanced diet and hit your macros.

I used to keep cans of V8 in my desk at work for nights I was working late and about to crash. One can would keep me going a good 1-1/2 to 2 hours. Lifesaver. Loaded with sodium, though, so you might see some water retention on the scale. That said, I would still prefer to eat those calories in whole fruits or vegetables if not under duress.