I don't have a bunch of data for you...
I have read some information that backs up both of those point of views, it is confusing!
The reason anti-artifical sweetener info says that your body reacts the same way to sugar when you have them is because Splenda/Sweet n low/ Equal, etc. taste sweet, and when your taste buds sense that they tell your brain "hey, something sweet is coming your way, get ready!" so then your body reacts by preparing to create insulin, but then it senses that there is no actual sugar coming in, so your body readjusts its insulin response.
They're safe for diabetics because your blood sugar doesn't actually go up when you ingest them, they just don't cause the same insulin spike, even if they make your brain think it's getting sugar.
My opinion- I'd rather trick my brain into thinking I'm eating something sweet rather than deal with damage that sugar can cause.
Diet drinks are talked about as bad because the studies they do are on people who drink them all day long, constantly, so yeah they're ingesting way more artificial sweeteners than they should be
http://www.health.harvard.edu/blog/a...t-201207165030
http://www.mayoclinic.com/health/art...teners/MY00073
http://www.webmd.com/food-recipes/fe...weeteners-safe