Clearly, the JH customs will have more velocity, depth, layering et cetera. than a lone single driver, but I found the JH13's and JH16's quite flawed actually, the JH11 was my preferred model after three demo sessions of all three.
As a single driver the FAD's have higher purity and finesse, the note within the note. The JH's take 1 apple and turn it into 4 apples, or 6 apples, it's still an apple. The Final Audio IEM's don't try to impress you with lots of apples, they serve you a small slice of the other world, the 音の幽霊.