Jwyatt, the RRD-6CL is a newer control, so it has not been tested with as many LEDs as the 6NA. As we do more testing, the list of compatible LEDs for the 6CL will grow.
The 6CL does not require a neutral, so if you had a wallbox that doesn't have a neutral wire present, you could use the 6CL as a 6NA would not work.