hi Eric,
to IIS!
What scope will you be using?
I think most people use the DMK41 simply because of the bigger chip, and the ability to capture the whole disc in one frame, or at least, use less frames when putting together a mosaic.
If you're using the Flea3, it will require more frames to get a full disc mosaic.
If you're using a big enough aperture solar scope, then the Flea3 might be better because you can do longer focal length shots (close ups of sun spots etc), and the higher frame rate (60fps) will be better than the DMK41 which can only do 15fps.