I guess it's much harder to adapt to life outside the cult for born-ins.
They never knew normal. They don't know how to behave socially, they have warped views of personal boundaries.
On top of that more likely than not a good part of their family is JW, and all of their friends.
Converts probably know how to behave outside the cult. They have non JW family. They may have retained some non-JW friends at the back burner.
However, 66% of born-ins eventually leave the JW, vs 33% who eventually leave JW over all members (if I recall correctly).
That would mean that almost all who leave are born-ins. Converts are apparently really really sure and blinded (maybe because the 'sunk cost' are much greater for them?).
Basically both are screwed, because it's a cult.