Believe it or not ... FROZEN CONCENTRATE is the next best thing to fresh - then the refrigerated juices that are made from concentrate (these are produced throughout the year to meet demand) ... the bottled stuff is at the end of the food chain. The main reason is vitamin degredation when subjected to heat for sterlization and botteling or stored above 38ºF for more than about 12 days.
As for the concern about "added stuff" - read the label. Let's take a can of frozen orange juice concentrate for an example. If the indredients listed is something like "100% all natural Florida Orange Juice" - it has no additives of any kind. And, yes, fruit juice fresh squeezed does contain sugars ... in the case of orange juice it's about 50% Sucrose, 25% Fructose and 25% Glucose. If they didn't contain naturally occuring sugars they would not be sweet. Fruit "drinks" are not the same as pure fruit juices ...
Juice vs Fruit: You're throwing away part of the nutritional value of the fruit is you just squeeze it and only drink the juice ... you're throwing away some nutrients and fiber thatdo not wind up in the juice.
Not All Additives are Bad: During the process of botteling juices they are heated and that causes a loss of vitamins. Adding back the vitamins lost during processing isn't IMHO a bad idea. The same thing happens during the pasteurization of milk ... but the main vitamin loss there is Vitamin D, which is added back in. Added Calcium isn't necessarily bad, either ... my step-mom has a poor appetite so it's hard to get her to eat enough high calcium foods - but she will drink OJ with added calcium so that is what I give here (with the blessing of her Doctor and a Ph.D. Nutritionist that I have worked with for about 25 years and trust).
If you're looking for the most nutrition - the best thing is eating fresh fruit ... followed by fresh squeezed juice, then use frozen concentrate, then juice made from concentrate, then the bottled stuff.