I can only speak to the US card but...
The secondary card does grant additional:
All elite statuses (hotel and car rental)
Lounge access (Airline, Centurion, Priority Pass Select)
Global Traveler, TSA PreCheck credit
Access to the various Amex travel programs (luxury hotels and member experiences)
All the card insurance programs (purchase protection, travel insurance, etc)
The secondary card does not get an extra $200 in airline fee credits. The primary and secondary cards share the same $200 fee air credit.