Different kinds of sugar are all sugar when they get to your gut. Anything beyond “the body treats this like sugar” is just a pissing contest.
When you juice something, you’re leaving 95% of the nutrients in the fruit, extracting the sugar water, and telling yourself you’re drinking healthy. That’s just not the case. The meat of the fruit is where that stuff is at. The fact that some of it makes it in to the juice is incidental. It would be better to drink a glass of water and eat the orange, than to juice the orange. Unless you then throw the juice away and just eat what’s left of the orange. That’s probably the best thing.