I've been to both Royal Orchids and the food is good, though clearly adapted to the tastes of the UAE market. The restaurant at the Hilton serves alcohol whereas the one off Salam Street is dry.
The service from the staff is good at both.
Price is not too bad compared with other Abu Dhabi restaurants.
Green Tea, Pad Thai was fantastic!!! Beautiful decor, great service and most importantly good food. On the second floor of Abu Dhabi Hilton. Well worth the visit!