Markus, I see no good reason why a C11 would be preferable over your Dob if you get it tracking, besides portability. But it’s not a C11 fits under the arm anyhow.
Incidentally, the Edge HD with its correcting lenses gives better views over a conventional SCT when viewing a wide (for a SCT!) FOV, but brings no advantage to the on-axis image like when viewing/imaging planets.
It’ll be interesting to see how you get on with your 5D MkIV, obviously that’s no entry level camera
the high megapixel count is not necessary for planetary as the objects are rarely large, but the higher the frame rate the better.