ORY can be convenient and I mainly use it if I have a domestic connection, or if the flight is cheaper. The service is a bit inferior, both on the ground and in the air. The ORY long-haul lounge is not as good as the CDG ones, particularly food is quite basic. On board, the crews are used to doing vacation destinations with small business class cabins and the business class service is generally not as efficient. Really no reason to use ORY unless CDG is not as practical.