The carousels were the consumer models with higher models having more features.
Concurrently the Ektagraphics were the Pro models. They used the same optical systems.
I'm not familiar with the new Ektapro models. I guess because I haven't come near to wearing out the one I've got.
For image quality I don't think the Leica machines can be beat.I haven't been involved in the trade for a long time but
believe the Rollei and Braun machines came from Asia not Germany. Keep in mind, my memory is pretty much shot.