Diabetes is an issue of glucose excess, insulin resistance, or insulin deficiency.
Regardless of the type of diabetes, the ultimate is elevated sugar in the bloodstream that causes havoc/inflammation. Hence, sugar/carbohydrate/glucose excess should be avoided. Enter many sugar alternatives like Stevia, Equal, Splenda, Truvia, etc.
I recommend that my diabetic patients use artificial sweeteners if they HAVE to have it in their food/drink. Most patients hate the idea of switching from regular soda to diet, but for a diabetic any sugar is like FUEL ON A FIRE.
In most cases, fructose/glucose /sugar excess should be avoided (except low sugar aka hypoglycemia).
The debate on the harms of our artificial sweeteners is ongoing. As it stands, these are less harmful to you than excess sugar (aka brown sugar). For those that look online, you'll find tons of "research" against Stevia and other artificial sweeteners. Those that dive deeper will find this is typically political or money-driven.
In the end, use everything in moderation. For diabetics, use artificial sweeteners if you must. This is preferred over straight sugar, including brown sugar. Do not fall into the branding trap of "natural" and "organic". These are branding tactics only. If you want a 100% safe answer, drink water and unsweetened drinks.
Hopefully this helps guide you.