I think the Splenda may cost more to buy so companies stick with Nutrasweet. That may change as the pricing equalizes.

There was a whole thread on the new Cokes in OMNI.

Coke Zero has a higher content of Nutrasweet/Aspartame and the addition of another sweetener, acesulfame potassium or ace-k.

Diet Coke with Splenda is nasty. I don't know how they ruined it. Splenda replacing Nutrasweet in most sodas has been an improvement. Coke Zero and Diet Coke taste better.

I prefer Diet Rite, splenda, ace-k and no caffeine.