Sprints and HIIT style exercise is shown to deplete muscle glycogen much, much faster than cardio.

From the top of my head: a 20 min HIIT session outperforms a ~2 to ~4 hour cardio session when it comes to glycogen depletion.

So doing cardio for blood sugar control (depletion) is probably a bad idea/waste of time (assuming you don't like to do cardio). Though obviously it's possible it may vary from diabetic to diabetic and from a healthy to a healthy person in extremes. A GCM is cheap to test it out.

For people talking about gym: legs are over 50% of your muscle mass so obviously chest and biceps curls aren't gonna cut it. Leg work is needed.