Why not ask the lady herself
She uses both DSLR and dedicated CCDs.
Some targets are not really achievable with a standard colour DSLR as most of the image is in a wavelength that will not be picked up by the camera.
So it is (as always) horses for courses. Some targets will look nearly as good through a DSLR as with a dedicated CCD, some will look quite poor.
Both require good tracking, and a lot of work to get great results.