For CNC on Snapmaker I havent found anything that comes close to Fusion 360. It has to be something that outputs Marlin GCODE (I am not into converters) and that limits choice. SOLIDWORKS would probably be great but I have no access to a license at a sensible price - you might if you are in the US.
But it’s hard, lots of new concepts, huge choice of options so if you go that way be prepared to watch loads of tutorials. good thing, there are loads.
I also use Fusion 360 for all my 3D print models so once you master it you have great workflow. For 3D print it’s model in Fusion, output directly to Cura or Prusa, feed directly to OctoPrint and I dont need to get up out of my chair.
Just seen @Hauke response, I think we agree.