If you're talking about 1-bedroom and up, the OKW balconies are quite a bit larger than any other DVC - and most look onto trees, golf course, or lakes. If you're talking about studios, the balconies aren't that much larger than Saratoga - maybe a few feet deeper, about the same width.
For privacy, the balconies at OKW are never completely secluded from view - the living room windows of the next-door villa look towards the balconies of the 1-bed villas, and the studio balconies are overlooked by the 1-bedroom villa living room windows. But the views out of both are generally peaceful and scenic.
Saratoga 1-bedroom balconies are mostly not private - when on the balcony, other balconies next door are in line and usually can see each other. Some rooms will look towards lakes, Disney Springs, or forested areas, while others may look at parking lots, pools, or pathways...it depends on what you can get when requesting more scenic views. But there are SOME balconies at Saratoga which can be very private - a few balconies in some buildings along the two wings facing the back of the buildings are 'boxed' - they have walls or bulkheads along the sides and roofs overhead which mean no one next door can see you on your balcony, and if the view is out towards a lake or towards Disney Springs on a higher floor, can be very private and relaxing with nice views. I always request these - but there's of course no guarantee you'll get them.
OKW 1-and 2-bedroom balconies will be the largest on property and it's hard to get a bad view at any of them.