My biggest complaint about Age of Rebellion is that it has so much repeated material from Edge of the Empire. To the point where I would advise not to get Age of Rebellion except to get X-Wings. I also think that the new material in Age of Rebellion just isn't as designed as well as Edge (For example, the Infiltrator spec tree doesn't give Stealth as a class skill).
I do think that the Force and Destiny book is much better.
There's a lot of stuff that's not duplicates - about half the talent trees, about half or more of the vehicles, over half the NPC templates, most of the non-rules text. There is some significant overlap...
Ships & Vehicles
Edge: 89
Age: 48
F&D: 29
All three: 6 (BTL-S3, BTL-A4, T4A Lambda, CR-90, CR-92A, TIE/ln)
Edge and Age: 9 (adds Nebulon B, Storm IV cloud car, 74-Z speeder bike)
Edge and F&D: 7 (adds AT-HCT,
Age & F&D: 9 (adds T-65B Xwing, Secutor Class SD, Victory Class SD)
So... Age has 9 39 not in edge, and F&D has 22 not in edge...
only 10% of edge is included elsewhere.
1/5th of Age's craft.
NPC's:
Edge has 69
Age has 58
F&D has 45
In all three: 3 (medical droid, Stormtrooper, Stormtrooper Sergeant)
In Edge and Age: 13
In Edge and Force: 2 (Planetary Defense Force Trooper, Street Tough)
In Age and Force: 1 (Guilded Bounty hunter)
Note, however, there are a lot of similar templates; such as there are police type templates in all three, but they aren't the same.