Anyway, I bring this up for some personal anecdotes.
I've been a Diet Coke man for decades just because I preferred the taste. Had to move to the unleaded variety on Dr.'s orders (fortunately, that's a popular beverage in Utah and widely available). I prefer diet versions in my lemon lime drinks too or 7 up if sugared is all there is as its much less sweet. The sweetness is also why Pepsi just isn't even on my list, way too sweet. For rootbeer, cream and ginger ale, the sugared is my preference.
Another friend was a Coke man through and through. A few years ago, his company sponsored Weight Watcher's to come and would pay for any employee who would follow through on the WW points program. This friend did so, and has lost a good chunk of weight. The major change in his diet was Coke. He goes with Crystal Light now. Lifestyle wise, he's pretty much a couch potato.
My most effective weight control techniques have been two things. First, I bought my first house and shed 20 pounds taking care of it. Then I had kids and changed my habits to set a good example. I certainly couldn't tell them no if I was eating it. That was good for another 35 pounds.
So rather than blaming a sweetener or a lifestyle or a diet, It seems to me that matching a diet (which certainly includes sweetener choices) with your lifestyle is the key to weight maintenance. If you want to eat a lot and be healthy, you need to be a physically busy busy person.
That seems sadly retro in today's media coverage on health.